system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why are clones mentally mature?

I know they are artificially aged and go through rigorous training but a lot of them seem to function like normal adults when only being a couple of years old. A couple of years of education surly wouldn’t equal maturity and life experience. Are they uploaded artificially memories?
gpt
It's simply part of their genetic programming. Their age/maturity is accelerated in every sense, physical and mental. 

One clone even remarks at one point that his growth acceleration chamber had a leak, which possibly made him hyperactive. It's possibly just a figure of speech but it kind of reflects how this works.

Edit: even fully mature clones aren't considered experienced. It's why "shinies" are ribbed for being rookies. So it's not the accumulation of memories that builds mental maturity, it's the physical maturation of their brain, plus the rigorous training, and then they mature more when they acquire their own experiences out in the galaxy.