What is Your Mental Age?

Where do we get our knowledge from? School, university, books, the Internet, and, of course, teachers and parents all help us learn about our surroundings. But have you ever thought about the real age in your head? Or how old do you feel? So, we offer you to test what you've learned. On the basis of your answers, we will try to guess how old you are mentally. Are you ready? Then let's get started!