I know a lot of people will deny this, especially because the extreme cognitive dissonance and superiority complexes but Intelligence Quotient, also known as IQ is the most accurate test. For an example, having 100IQ means you're 10 years old and anyone having even a bit above that can fully agree that such people are stuck at that age mentally. So, to be of a legal age and have rights, you should have 180IQ and increase it every year or fear to be treated like the immature person you're.