Cognitive aging doesn’t hit everyone the same way, and it’s not all negative.
Although this article is written to an aging diver, and you may not be there yet, this advice equally applies to your customers.
Diving has always attracted people who love adventure but also appreciate order, planning, and control. And as we get older, most of us become even more intentional about those things. We know our backs don’t like giant strides the way they used to. We feel our ears a bit more. We take more time and effort climbing the boat ladder. That’s all pretty obvious.
What’s far less obvious, and frankly, a lot more insidious, is subtle cognitive change. This isn’t about “losing it” or being unfit to dive. It’s about recognizing that the same aging process that affects our knees, shoulders, and back can also affect our memory, attention, and decision-making. Underwater, where the environment can be very unforgiving of error, those changes can matter. The good news is that we can plan for this, just like we plan breathing gas, decompression, and equipment selection. Awareness and preparation go a long way toward keeping older divers safe, capable, and confident.
Cognitive aging doesn’t hit everyone the same way, and it’s not all negative. Experience, judgment, and pattern recognition may actually improve with age. That’s why older, seasoned divers are often the calmest in a crisis and the best at anticipating issues before they become problems. But some abilities commonly decline, even in healthy aging. Processing speed can slow down; we may take longer to absorb and act on new information. In diving, this can mean a slower reaction to an equipment issue, an environmental change, or a buddy signal. Working memory, the “mental scratch pad” we use to keep track of information in real time, may not be as sharp. Underwater, you rely on it to track breathing gas remaining vs. depth vs. time, follow a navigation pattern, or remember the last step of an emergency procedure while you’re still performing the first one.
On land, a little forgetfulness or slower reaction time is often just an annoyance. Underwater, it can become a real hazard. The diving environment is complex and dynamic: currents, boat traffic, changing visibility, unexpected marine life, and problematic entries and exits all demand attention. Diving loads us with tasks: we manage buoyancy, navigation, breathing gas, communication, perhaps photography, and sometimes students or less-experienced buddies. Physiologic stressors such as nitrogen narcosis, cold, exertion, CO₂ buildup, exceeding maximum operating depth (MOD) when diving with Nitrox and possible subclinical decompression effects can amplify minor cognitive deficits. And underwater, we often have limited time to correct mistakes. A navigation error or missed turn on land costs a few extra minutes; at depth it costs breathing gas and can escalate anxiety. Aging itself is not the problem. Unrecognized and unplanned-for cognitive change is.
It helps to know what to look for. We should be watching for patterns, not one-off slips; everyone occasionally forgets something. You should pay attention when you see trends, especially if others notice them too. Potential warning signs in older divers include repeatedly forgetting critical pre-dive steps such as turning on breathing gas, opening the cylinder valve fully, or checking dive computer batteries. There may be increased reliance on others to set up or verify gear preparation and configuration when the diver previously handled this independently. Some divers start having trouble remembering the dive plan, even after reviewing it several times shortly before the dive. Others become confused about navigation cues, have difficulty retracing a simple route, or find themselves getting turned around more often than in the past.
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Difficulty following multi-step instructions can appear, such as “If we lose the line, we’ll do this, then that, then ascend to a specific depth.” Underwater, there may be slower responses to hand signals or delayed understanding of basic communication. Anxiety or disorientation at depth may increase compared with previous years, even on routine dives at familiar sites. Decision-making may become uncharacteristic, either more impulsive (“We’ll just go a bit deeper, it’s fine”) or more hesitant and indecisive than before. Importantly, these signs should trigger curiosity and evaluation, not fear or shame. The goal is to understand what’s happening and adapt, not to ground someone from diving unnecessarily.
Not all cognitive decline is “just aging.” Some causes are preventable, treatable, or at least modifiable. Cardiovascular disease and hypertension, for example, can reduce brain perfusion or lead to small-vessel disease that affects memory and cognitive function. Diabetes, especially if poorly controlled, can impair cognition both acutely and chronically. Sleep disorders, especially sleep apnea, can dramatically affect attention, reaction time, and judgment by disrupting sleep night after night. Depression and anxiety often reduce concentration and working memory. Then there is mild cognitive impairment or early dementia, which may be quite subtle at first but worsen under stress or in unfamiliar contexts, such as an underwater emergency.
Medications add another layer. Older divers are more likely to be taking sedatives or sleep medications, certain “Z-drugs” or benzodiazepines. Anticholinergic medications used for bladder issues, allergies, or nausea can impair cognition. Pain medications, especially opioids, and some anti-anxiety or anti-seizure medications can cause drowsiness or confusion. Any medication that can cause drowsiness, confusion, or slowed thinking on land is certainly a red flag underwater. Divers should review all medications with a physician or a specialist familiar with diving medicine, or call the Medical Department at Divers Alert Network (DAN) to get information to help understand how these drugs might interact with depth, narcosis, and exertion.
The interaction of aging, narcosis, and breathing gas choices is particularly important. Age doesn’t “cause” narcosis, but slower processing and reduced cognitive reserve can make the effects of narcosis more impactful. A younger diver with sharp working memory may remain functional at a narcotic load that would seriously impair an older diver already working near their cognitive limits. Even modest narcosis can tip an older diver from “a bit slow” to “unable to manage multiple tasks” at depth. That has practical implications. As we age, it makes sense to be more conservative with depth. What felt easy at 100 feet at 35 may not be quite as manageable at 65. Breathing gas choices for the older technical diver require thought; using mixes that reduce narcosis, such as trimix on deeper dives, may be beneficial but only as part of a comprehensive training and risk-management strategy. Above all, we must recognize that narcosis plus cognitive aging plus environmental stress can multiply risk, not just be additive.
The key to safe diving at any age is safety margin and proper risk management. As cognitive reserve gradually changes, we can preserve safety by increasing those margins and simplifying our dives. That starts with the dive profile. Older divers do well to prefer shallower, shorter dives, especially in challenging environments. We should avoid combining stressors; deep, cold, current, and low visibility are not the conditions to test limits. Breathing gas reserves can be increased beyond what we once considered acceptable; larger rock-bottom reserves, more conservative turn pressures, and generous surface intervals all help.
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Task loading is another area where we can build margin. It’s worth taking an honest look at equipment and procedures. If gear complexity is no longer adding value, consider simplifying. If you’re not actively using a piece of equipment, ask whether it is truly necessary or just one more thing to monitor or misconfigure. Underwater, limit significant multitasking. If you’re doing photography or video, treat navigation and breathing gas checks as priority tasks with scheduled checks, not “whenever I remember.” And think carefully about high-responsibility roles: leading large groups or managing students can be very demanding. If you notice it’s becoming harder to track everyone and everything at once, it may be time to adjust your role.
Older divers benefit from rigorous, repeatable pre-dive routines. A printed or laminated pre-dive checklist that you follow every time, even on “simple” shore dives, can be invaluable. Include self-check and buddy check components: is your breathing gas on and the cylinder valve fully opened, are valves verified, is the inflator functioning and are dump valves clear, is your dive computer set and functioning, and are weights secure and appropriate? Review the dive plan clearly and concisely: maximum depth, turn breathing gas pressure, time limits, lost-buddy procedure, ascent profile, and safety stop. Repetition builds habit, and habit reduces reliance on working memory.
Communication is another area where small changes can pay large safety dividends. Subtle cognitive changes can make ambiguous messages more problematic, so simple, unambiguous hand signals are best. Review signals before the dive and agree on straightforward “if-then” actions: if you signal low on breathing gas, we immediately ascend together; if we lose each other, we search for up to one minute and then surface safely. Complex signals or plans that require remembering multiple conditionals can set divers up for confusion when stress levels rise.
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Buddy choice matters more than ever, not as a crutch, but as part of a shared safety system. Good buddies for older divers are calm, patient, and observant. They notice if you seem off and check in without being intrusive. They are willing to stick with the plan and are not prone to “just a little deeper” or “let’s push the limit this once.” They are proficient but not overtasked; a heavily task-loaded videographer or an instructor juggling multiple students may not be ideal. It can help to be frank in advance: “I’m still very comfortable diving, but I’m at a stage where I really value clear plans and conservative profiles. I prefer to avoid last-minute changes or pushing limits.” That’s not weakness. It’s professionalism.
The dive operation you choose can support or undermine these efforts. Look for operators who respect individual limits and do not pressure divers into dives beyond their comfort or training. Clear, structured briefings that repeat key points make it less likely that anything critical will be missed. Let the crew know if you prefer to go slowly on descents and ascents, stay shallower, or remain close to the guide. You are not asking for special treatment; you are aligning the dive with reality.
The brain, like the body, responds to training and support. You can promote cognitive health in ways that directly benefit your diving. On land, physical fitness matters. Regular aerobic exercise, strength training, and flexibility work improve cerebral blood flow, balance, and reaction time. Sleep deserves attention; consistent, high-quality sleep, especially before diving days, is one of the simplest ways to support cognition. Mental activities such as puzzles, reading, strategy games, or learning new skills can help maintain cognitive flexibility. But we shouldn’t overestimate “brain games” at the expense of whole-body activity and social engagement, which appear to matter more. Regular medical care is essential: manage blood pressure, cholesterol, and blood sugar; screen for sleep apnea, hearing loss, and depression, all of which can affect cognition.
There are also dive-specific ways to support the aging brain. Dry runs or dynamic rehearsals of emergency procedures, such as mask removal and replacement and sharing breathing gas, practiced slowly and deliberately on land, build muscle memory and reduce cognitive load underwater. Quiet mental rehearsal before a dive helps as well: “If my mask floods at 80 feet, I’ll stop, stabilize buoyancy, clear it slowly, signal my buddy if needed, and reassess.” After each dive, a brief, honest self-debrief can reveal trends: did you feel mentally sharp, did anything confuse or surprise you that shouldn’t have, did you forget any steps or checks? Patterns over time are more informative than any single dive.
At some point, most older divers adapt how they dive. That might mean focusing on shallower sites, eliminating overhead environments, or choosing simpler conditions. It may mean stepping away from teaching or leading. Very rarely, it may mean stepping away from diving entirely. Certain red flags require medical evaluation and serious reconsideration of diving. These include getting lost or disoriented on simple, familiar dive sites repeatedly; repeatedly forgetting critical safety procedures or how to operate essential equipment; episodes of confusion, disorientation, or not recalling portions of a dive; noticeable deterioration in day-to-day memory, judgment, or orientation on land; and strong concern expressed independently by multiple dive buddies or family members.
When these arise, the safest course is to stop diving until evaluated, consult a physician knowledgeable in diving medicine (or coordinate between a neurologist or geriatrician and a dive medicine specialist), and be honest and thorough about symptoms, dive history, and goals. Stepping back temporarily to clarify the situation is far better than pushing forward into a preventable accident.
Many of the best dives I’ve witnessed were not the deepest, longest, or most technically complex. They were slow, controlled, observant dives where divers took their time, stayed well within their limits, and came up smiling with plenty of breathing gas to spare. Older divers bring enormous value to the diving community: their judgment and calm, their respect for procedure, their appreciation of small underwater details, and their willingness to plan ahead and share experience.
Cognitive change is part of the same continuum as reduced flexibility or slower fin kicks. Recognize it early, plan for it thoughtfully, and build habits and margins that support it. With deliberate adaptation, many divers continue to dive safely and enjoyably well into their 60s, 70s, and beyond. Diving has always been about managing risk, not eliminating it, and doing so in a way that lets us keep enjoying the underwater world. As you age, you haven’t outgrown that responsibility; you’ve grown into it. Dive within your true limits, not your remembered ones. Put structure around your experience. Talk openly with your buddies and your dive professionals. In doing so, you not only protect yourself, you help define what safe, successful lifelong diving can look like.
Additional Reading: Orr, D. and Orr, B. 101 Tips for Recreational Scuba Divers. 2023. Best Publishing Company. Orr, D. and Douglas, E. Scuba Diving Safety. 2017. Best Publishing Company. Orr, D. Diving Safety articles in Scuba Diving Industry Magazine (www.scubadivingindustry.com).
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