I was able to do it at age 56 but at elevation in both Sattley and Moriarty. Possibly the most impressive time I’ve seen was turned in by Scott Hennessey (former 50+ record holder whose record was broken by Kevin a couple of years ago) who went 53:50 at Sattley at age 64. The 60+ record is ~ 52:30 IIRC but not sure of the age of the rider (Scott Fuller ??) who set it. This is an even better story as Scott came back from some health issues that forced him out of the game for a few years. He’s flyin’ again now.