I have been pretty lucky. The injuries I have had haven't caused as much problem as they do for others. Something you WON'T have any control of is what arthritis does. I am still the same weight as I was when I graduated from college (160) and I can't think of many who can ride a bicycle as far or long as I can (though I am not a daily rider), and none that swim as long. But there are some things like that (arthritis etc) that can make you wonder how long you do have. My friend LeRoy is in his 80's now and loving a Honda Grom.