There's a lot of fuss about achieving genuine maturity in games. An uncomfortable amount of this discussion is coming from people who want to delegitimise games they dislike. But if they can use subjective definitions for their own purposes so can I.
My definition of maturity involves not caring what other people think. This doesn't mean taking the idea to its ridiculous extreme — you can still seek advice and treat other people well. But maturity is a particular sense of self that, at its heart, does not rely on how others perceive you. An identity secure enough not to amplify its own uniqueness either, just accepting it.