Originally Posted by
staehpj1
... I still might do some 100+ mile days at my age, but after some time getting road hardened.
^^^ Road hardened! Exactly. For me something magical hits in after about two weeks - my legs get stronger, my average speed increases and daily distances go up.
That said, I love listening to my body, not planning the days ride... stop, or rest whenever... or ride on and on...
Seldom is a day shorter than 60 km or longer than 120 km, though both can happen