Violette, I can ride farther in headwinds than i could when i was in my 20's.
It is not your age, but your conditioning.
I could barely ride 5 miles when i was in my 20's. now I can ride 50 without training for it.

the difference is that I was able to sleep and rest/recover better in my 20's than i can do now at age 56.

I rode a double century (120 miles one day, 80 the next) a few years ago. Instead of being so tired i went right to sleep, i could hardly sleep. That affected my recovery to be sure, but also my resolve. I was going to finish that ride if it killed me. I was not near that tough in my 20's