Ronno6- I’m seeing some of the same things as you. I’m justifying it as age related. I’m even seeing it in other activities like golf. I play 5 days a week and even with the all the new technologies the ball just isn’t going as far!!! Sure is frustrating.

I have younger friends that want me to ride with them but it’s becoming less fun just trying to stay with them. I’m not able to get my HR up as high as I could when I was doing time trials. In my case I was off the bike for a hip replacement and between some loss of fitness and muscle strength during that time it just hasn’t come back. I think I might be able to regain some of it with some very focused and intense training but it’s just not worth all that work to me. I can still do longer rides, it just takes longer.

Good luck getting it all figured out!!