I'm 65 and do pretty much what I did when I was 50ish. Plus I've taken up golf this year, and only ever walk. Been very fortunate given my orthopedic history
(two back surgeries, seven knee surgeries finally with two new knees, and a rebuilt right shoulder after a fall on the ice). Absent anything drastic, hope to be roughly the same at 75. Staying active really is the key. That and keeping a positive attitude about life in general.