Well I’ve already been outclassed in the wrinkle waving 😆
I’m 56, been riding bikes on and off for 45 years or so but it’s only been my main activity/sport in the last three years, climbing and running were my main sports before that. The group I ride with vary in age from mid 30s to their late 60s, the older ones don’t hold back either, they are more than happy (and competent) on reds and blacks as well as technical stuff in the Lakes and elsewhere.
As you get older you:
Don’t bounce so well
Take longer to recover from injury
Have to move ever faster to stay still.
Don’t feel like you have to prove anything.
Sure I’m not as fast as 18yr old kids down the descents but I get Strava top tens on climbs (and flats) on and off road so that’s one to the crinklies 😀
It’s only society telling you that sport is for young people – you don’t have to listen.