Over the hill for what, though?
I'm in my 60s. Work full time, ride my ponies, walk my dogs, do my garden, have an active and very fulfilling sex-life with my slightly younger DP.
No I can't do certain activities anymore (knackered knees so no marathons!) but I have my own teeth and hair and am still a size 8/10.
So, no, I do not consider myself even in the foothills, let alone over the damn thing!