There are a lots of people who don't know there are two types of age. The first one is physical age and the second one is brain age, this app is related to mental age test. I believe in this you were noticed sometime there are some people who's age is less than maturity age but they talk like a mature person so this is where mental age comes in. Sometime you were noticed the person age is too high but their habits and talking style is like a childish. So they are not mature from their mental ag