Yeah I think that's the truth.You're racing mostly with younger blokes. From 50 its a slow descent for most. Some do keep a better level. You're are nearly 60 and putting very respectful numbers out, dont knock yourself
Put me in a TTT or ITT and I'll roll along comfortably as a B cat, but ask me to put out silly watts at the start and I'm just not there. I'm not far off to be honest, but far enough.
The Cat system is pretty unkind when in your in your 60s, although if I check out other riders there are guys in their 60s who are putting out some big watts.