Well, I have friends as old as 85 who have had successful hip replacement surgery. One can ot make blanket statements based on age - every person is different. Some people may be "too old" at 60 based on physical condition and attitude. Other people are energizer bunnies well into their 80's or even 90's - I may just take a little longer to heal.
My friend had knee replacement at 79 last summer, and she is line dancing with her grandkids, gardening and teaching painting classes.