Yes! However, girls also physically mature faster than boys. Girls are generally done growing around 14. Boys can keep growing until their early 20s. It is, quite literally, nature and nurture. Who knows, even in a perfectly egalitarian world girls may still mentally mature faster than boys. We have to create that world to find out. For human rights, and for science.
my book of poetry “Soft Thorns”: http://amzn.to/2sO98xh