well yea, you can hike acxross the artic ice cap if you want, just coz it accessible doesnt mean many people do it, certainly not old men,
now dont get me wrong, im a firm beliver, that 50 odd year okd could do it, that they can maibtain a very high level of fitness well into their 60s, just that the people who dothat are from observation of my contemporaries, a very small % of the whole, even more that once you have let yourself go, its difficult in the extreme to get it back again, your likely to have lost 20lbs of muscle mass by the time your in your 50s if youve been compartaivly sedimentary for the 20 years or so, just putting on that level of muscle mass can be taxibg in the extreme and take an excesivly long time in your 50s
which is why those that do sort themselves out tend to go for endurance rather than power sports, as the loss of muscle mass is less important and can even assist