Still young myself at 52. I can't cruse at 30mph like I could in my 20s. Nor have I done a 65mph decent in 20 years. It seems like inflammation takes longer to go away, so I treat it more carefully. Then I don't slam into radical extremes any more, but ratchet it up over several rides. I haven't hit the ground but once in 20 years, but I tore a muscle in my ribs, which never happened before.

Mainly, I ride a much more comfortable bike. The same riding position, just bigger tires, better saddle, shoes etc. And I am back to riding steel.