The chemistry is a good point.
Apparently, puberty doesn’t fully finish until we’re around 25 years of age.
Brain finished that stage. There are cognitive differences typically between, say, someone who is 20 and 27 years of age.
I always thought I was smarter at 11 yrs old, got stupid for a lot of years, then suddenly woke up again around 25-26 yrs old.
Similar thing about 2-3 years ago.
Not that I was asleep just that there was a noticeable cognitive difference in how I processed my thoughts and feelings.
Yet at the same time, I’m no different. Ship of Theseus. Always changing without changing. smile emoticon