High Altitude Hiking After 50: What Changes and How to Prepare
Acute mountain sickness does not discriminate by fitness level. What changes after 50 is a somewhat slower cardiovascular response to hypoxic conditions — the heart and lungs take a little longer to adapt. Research from the Wilderness Medical Society suggests that gradual acclimatisation matters more than it did when you were younger, not less.
The good news: the Tetons, the Wind Rivers, the Colorado 14ers — all of them are accessible to fit 50-plus athletes who prepare properly.
The acclimatisation fundamentals
The standard guideline is sound and has not changed: above 8,000 feet (2,400 metres), do not increase your sleeping altitude by more than 1,000 feet (300 metres) per day. For every 3,000 feet of elevation gain, spend an extra acclimatisation day.
That means flying into Jackson Hole (6,237 feet) and hiking into the high Tetons the next morning is a plan for a headache. Spend two nights at valley elevation first. Day-hike higher. Sleep low.
Fitness helps but does not protect you
This surprises athletes. A fit 55-year-old is not protected from AMS by cardiovascular fitness. Altitude sickness is primarily a function of how fast you ascend, not how fit you are.
What fitness does help with: managing effort, maintaining energy over long days, and recovering between days on the trail. These matter significantly for a multi-day route in the Winds or a hut-to-hut traverse in the Alps.
Medications worth knowing about
Acetazolamide (Diamox) is the standard pharmaceutical tool for AMS prevention. It works by stimulating breathing and accelerating acclimatisation. A sports medicine physician or travel medicine specialist can prescribe it and discuss whether it is appropriate for your situation — particularly relevant if you have any cardiac history.
Ibuprofen at standard doses has some evidence behind it for AMS symptom relief but is not a substitute for proper acclimatisation. Descend if symptoms worsen.
Training for altitude at sea level
Cardiovascular base matters. Get your aerobic fitness as high as reasonably possible before any altitude objective.
Leg strength matters more than most people expect. Loaded squats, step-ups, and single-leg movements translate directly to long days on steep terrain.
