What happens to a person when he grows up?

A person grows up gradually. It is believed that full adulthood occurs at 18 years old (in some countries at 21), but age is only a physiological feature of a person. You can be a child even at 20. There is a concept of “psychological age”.

When a person grows up, he:

1) Perceives this world differently;

2) Becomes serious;

3) Is independently responsible for his actions (is responsible);

4) She plans her future, and does not live alone during the day.