I'm still confused as I always am.
If you are happy with your bikes and how you ride and fit on them then what's the issue? If you find at some point there is a goal that you can't achieve that other your age and health are doing then that might indicate a fit issue or wrong bike for the purpose.
But if comfortable on your bike doing what you want to, then what's to worry? But you can be comfortable on the wrong bike not achieving the performance goals you might have.