That could well have something in it.
If any compartison may be drawn to alcohol, I think the higher the legal age is set for drinking, the longer it takes for people to develop a mature relationship to alcohol. I mean, kids in France practically go from breast milk to wine (in small quantities, and under supervision) and they have nothing like the levels of problem binge drinking we have in the UK. And the age limit of 21 in the US just flabberghasts me.
Returning to the age of consent, yes, people mature at different rates - there are fifty-year-olds who can't make a mature decision about anything, and there are 14-year-olds who are incredibly sensible and grown up. Of you're legislating, you have to draw the line somewhere.