I'm over 60 and have been using TeX since '85.
Same manual after all these years...
I still seem to be able to learn new stuff,
though it's not always clear it's worth the bother.
Indeed, I was 30 and my brain was still plastic.
Really, the only notable thing from my post was the fact I'm still using the same Latex manual after all these years.
Kinda ragged now, but still useful.