Well then, prove it.
Discussion
Bodies and brains never stop changing. Just like our bodies our brains develop very quickly ages 0-3 and 9-13.
Post-puberty our bodies and brains change slowly. You can call that development or you can call it decay, but it is very slow.
Nothing significant changes in the human brain in your 20s. Literally nothing.
Between ages 13 and 50 you lose about 20% of your gray matter, and gain about 10% of white matter.
These are not dramatic differences.
Teenage brains and middle aged brains are very similar.
."Brains fully developed at 25" is an urban myth. It has been thoroughly debunked.
Slate did an excellent summary:
https://slate.com/technology/2022/11/brain-development-25-year-old-mature-myth.html
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Our brains are largest and fastest around age 13.
Most of the sensational bombastic media pieces about brains in recent years were based on junk science from fMRI studies with tiny sample sizes that nobody knew how to interpret and could not be replicated. It was all garbage.
Vox did a good summary of it
The myth of brain development continuing until you're 25 comes from the fact that our brains slowly gain white matter even after puberty.
The problem with that theory is that it doesn't stop at 25. You gradually get more and more white matter in your 30s and 40s too.
So if that is what makes us "Fully Developed" then we are children until age 50. (which is of course fucking ridiculous)
There is no point of "fully developed". That's just a stupid red herring. It means nothing. Nature doesn't work that way.
Young adults aged 14 or 15 have very little experience. So they make mistakes that we would avoid. There is nothing wrong with their brains tho'
Here's some of the bombastic pop-science bullshit that got everyone believing that 24 year olds are children.
