Here's my two cents.....
I retired at 60, moved to the mountains, live at 8600 ft. elevation, and am out being active everyday. I'm 66 yrs. old now.
My favorite activities are hunting, hiking, and packing in with my horses/mule. Just today, my wife and I went out in the backcountry hiking.
I know I'm not 50 anymore, but still have a lot of years left in me, barring unforeseen circumstances. I'm already planning next years Elk hunt, where I plan to pack a camp up high on the mountain. I'll have to bring the pack string out, and hike back in, as there's no decent place to keep the horses up there.
I attribute my status to a little luck perhaps, but also a lifetime of fitness and healthy living. I ran long distance on rolling ground all my life, lifted weights and pretty much just kept in shape. I think that has kept me in both good muscular shape, but also cardiovascular shape too. My biggest concern, is my vision and hearing aren't what I wished they were. Oh well, I'll just need more luck to fill a tag. If I get a Bull, I plan on bringing it out alone. It will be a bit of work, but I'm not at all worried about the task. In fact I'm looking forward to it!