What did he mean by this

it's purely experience dependent, and it was my experience that kids that age mature rapidly and the difference between between me and people only a few years younger than me were vast. I hung out with older people in college, and don't know how they put up with me. I cringe thinking about how dumb i was. When I was a senior in college, they switched their suggested order to take some classes which resulted in freshman and seniors in engineering taking certain electives at the same time. I was in some bs intro to psychology class and even with senioritis, couldn't stand how half butt the freshman I got paired with wanted to do projects. It literally felt like babysitting. I couldn't imagine even wanting to date them and one was pretty hot.

it would be hard for me to relate to a 19 year old at 22. 22 year old me totally went after some younger girls, and it took me until about 24 to figure out that the maturity level mattered at least as much as how hot they were

I was still a dumbass at 20, but I was still mature enough to realize that I was really a dumbass at 18

“Lol women at 30 are much more mature and chill than a 20 year old”

No the frick they aren't, the female brain develops properly and is forever overly emotional.

Dr. Brizendine explains that the male amygdala, which also controls sexual thought, is twice as large as that of females. Fueled by testosterone, it triggers the typical teenage male brain to think about s*x every 52 seconds, compared to a few times a day for teen girls.

"When I hang out with my guy friends, it's really odd to think that every, like, whatever seconds, they're thinking about s*x," said high school student Sara Johnson. "And that you can't stop them from thinking about that."

Are Girls Really More Emotional?

When it comes to emotions, Dr. Brizedine says girls have their own area that's twice as large as boys' -- the hippocampus, which is the seat of emotional memory. The female brain uses many centers in both hemispheres that activate in response to faces, voices and expressions. Men, however, use only one side of their brain.

…girls, she explained, physically receive pleasure through the simple act of gossiping.

https://abcnews.go.com/2020/story?id=2504460&page=1

(I'm actually joking, maturity varies wildly by individual by on average women that are like 25+ with a grad degree are less insufferable….or they get 10 times worse)