How do you know if someone is mature or not?

When someone doesn't peep into your phone while you are texting, (s)he's mature.
When someone makes it sure to attend calls or texts from their parents, they are mature.
When someone dresses the way (s)he is comfortable and not to impress anyone with the ‘trending trends', (s)he's mature.
When someone doesn't use social media to say how madly they are in love or how sad they are, they are mature.
When someone replies back ‘OK' when you tell them that you are in no mood to talk, (s)he's mature.
When someone gives way to elders and children in public places, (s)he's mature.
When someone responds to criticism and haters with a ‘SMILE’, they’re mature.
When someone can clearly distinguish between their ‘WANTS' and ‘NEEDS' , they're mature.
When you are the priority of someone while you hangout alone with them, they are mature.
When someone believes in ‘hard work' and not ‘shortcuts', they're mature.
When someone loves your SOUL not your FACE VALUE , (s)he's mature.
When someone doesn't fake to seek your attention, (s)he's mature.
When someone takes their parents’ advice as a ‘blessing', they're mature.
When someone doesn't hesitate to apologise when they're wrong, they're mature.
When the biggest achievement of someone is seeing their parents happy because of them, they are mature.