Is it normal for humans to take so long to fully mature?
I personally think it takes us too long to reach full independency between the ages of 18-21 (or more depending on each individual's maturity levels). I think instead of becoming "adults" at 18, we should find a way of speeding our aging process to the point where we're grown by age 10.
Every other creature grows up alot quicker than us. So I think to make a large step as a species, we need to quicken the aging process. I mean, yes we would have shorter childhoods, we'd be able to have kids by ages 7-9, and we'd die alot sooner, but I think it'd be a good thing.