A depressed child. Adults have the notion that juveniles need to suffer. Only when they have suffered enough to wipe out most of their joyous spirits and innocence are they staid enough to be considered 'Adult'. See also: Mature.

v. To make rational decisions accepting the consequences and responsibilities that are associated with them.

Making decisions that your parents would have made. Sometime during college this happens.

When you're able to smoke weed on your own couch.

Someone who has reached sexual maturity. (according to Wikipedia)

The age the law thinks that is varies from 13-18 all over the world. Are you sexually mature as soon as you are able to reproduce? Or do you have to have stopped growing? What about a 40 year old virgin? Are you an adult once you have kids? Are you an adult once you take responsibility?

Many 18-60 year old "adults" act like children, and many 15 year olds are mature also. There are 30 year olds that can pass for 18 year olds and 18 year olds that look 30. There are 30 year olds that mentally still 15, and 15 year olds that are wiser than 30 year olds.

There are typically three states of growth though... child > teenager or adolescent > adult Identifying where the second stage becomes the third stage varies massively from human to human. I think there is an argument to say that some humans don't become adults until much later in life

A person who is 30 years old and owns a houseplant

A stubborn unreasonable person who think there so high and mighty but just a older version of a baby extremely hyprocrtical

An adult is when you're an, uh, well it's when you think you're a big boy, but really you're just a child in grown person's body and you hate your job and the other person that lives in your house.

A person who has stopped growing at both ends and is now growing in the
middle.