In Summit County, Colorado there are two groups of over 60 riders that ride the most difficult rides and ski the toughest runs and backcountry.

I know Don of the roadie group and Wayne of the mountain bike group best. Some ride with both groups.

Rode, or at least started a ride with the roadie group one day. I think they were all over 65.

They rode the Triple Bypass. Now they do the route on their own.
Their usual rides would leave most twenty years olds in the dust.

The local youngsters, in their twenties and thirties, have dubbed them the Gnarly Old Dudes, aka Gods.
Wish I could keep up with them.