ADULT

I realize that there are many "adults" who cannot behave like a grown-up.
Although I am now a college student, I still do not have confidence in myself as an adult.

For me, being an adult means that you are responsible for your own action.
No one can take responsibility for the result of your decision when you become a grown up.

Also, when I think about being an adult, it means that you are able to be patient with other people.
Even if a person is thinking in a different way and cannot meet your expectation, you should not be upset easily.
I learned this attitude when I was observing seniors in my club.
Some of them were respectable, but the rest seemed to be sometimes childish and impatient.
Before acting in a self-centered way, adult should think about others' feelings and see themselves objectively.

Well, I think growing older with age and becoming a grown-up are completely different things.
In addition, I think that a person is adult when he/she has own style:)
(style of fashion, hobby, work, life...anything)