Thanks guys, I was looking for a general trend. If older riders have noticed a change as the article pointed out about why we don't recover the same with age.
I think the answer given by topflightpro, a long time member here to be probably most telling. It does depend on each of us indeed and even our expectations of what we are trying to get out cycling...how hard we push and how often. If well underneath a high threshold than probably variability in recovery doesn't matter so much.

Here's a good article on Overtraining aka OTS:
https://www.bicycling.com/training/a...o-do-about-it/

on Recovery:
Whats the big deal with Recovery in Cycling? - Rowe & King