I'm definitely a little slower this year than last (I'm 59)and less inclined to sprint, but am doing fine mileage wise, and also seem to be less exhausted after a ride. Is this the new normal? Who knows? Two years ago I had a great year speed wise. I'm not willing to make any conclusions yet.
I ride for fun and fitness. I'm pretty fit, and having fun. (We are not the norm here. I wish we were, we'd have less of a healthcare crisis in the US. But that's another topic.) I'm sure I'll lose another 5-7 lbs before cold weather and the Holidays take their toll, and I'll be at about college weight. Blood pressure and resting pulse are very good. When I got my physical last Winter, the PA who took my Blood pressure and pulse looked at me and said, "Do you exercise or something?" I said, "Yeah, or something."