Wouldn't expect everyone to post their ages but my experience was that, at 60 the decline in ability was quite gradual, even through my early 70's. Still able to walk well for fairly long distances, use the chainsaw without trepidation, etc. From my mid 70's 'til now (pushing 87) the decline has become quite rapid. I hardly want to pick up the chainsaw, even if it's not running. Afraid I'll lose my balance and fall on the "teeth".
Although driving on local streets and expressways doesn't bother me, I don't have the vision for night driving. And walking without my cane is a challenge even on level ground. I can't believe the difference 10-15 years make after you pass into your mid 70's. I wasn't prepared for it and thought that I'd be in reasonably good shape "forever". Guess I was wrong, at least in my case.