My Cobalt topped out around 55 or 60 I think - the original records are lost in time.
I was 62, but in my opinion, if you are in good shape otherwise 81 is just a number. My 80 yo neighbor had 2 shoulder replacements last year and is doing fine. My 79 you friend had her knee replaced this summer, and aside from taking longer to recover than her last one (at 72) she's also doing great - ready to start line dancing again