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come to think of this what exactly age is a mature adult?

In my own opinion I don't think there's an age for maturity. Because you can see A much younger person acting more mature than an older person.

Last I checked, age doesn't tell a lot about maturity. You could see a teenager who is already really matured and you could see an 'adult' behaving so childish.

It's all about self realization.

You said it all. Maturity doesn't really have an age tag

Yes friend