Delicious said:
An age is merely a number, as everyone develops differently. So no, simply because I've lived through the same day on a calendar more than once does not automatically mean I've matured.
Then quite frankly, you don't understand psychology.
There are specific things that you learn as you get older. These things are tested, verifiable and most certainly age related. It's not a specific "on the 25th day of your 13th year you become capable of understanding hypothetical situations" but it is most certainly an age progression.
Psychologists like Piaget, Kohlberg and Erikson and many, many more prove this.
And we, as the human race, have only begun to understand how the brain works. That is sort of the reason psychology is still considered somewhat of a psuedo-science; we don't have enough evidence to say for certain why people act in certain ways.
And please try to articulate yourself better, I had to reread your post three times due to its awkward wording.
There are parts of the brain, ways of thinking, that are testable, watchable, and predictable in regards to adolescents and their development.
Adolescents (teenagers) are not just younger adults. There are many complex body differences (they are more hormones that affect mood, among other things) and there are many complex mind differences (they think differently about things than adults in many ways).
These are not because they are stupid or just "haven't lived life", adolescents have different minds than adults.