What are the attributes of youth?

I am not a psychologist. So this description should be taken as my subjective opinion. First attribute of the youth is positive attitude. That means he will see the brighter side of every thing. He will work for the betterment of every one and everything around him. The young looks at every one and every thing around him, with the hope. Young is one, who thinks that everyone and every thing around him is good. He sees happiness in nothing. He is happy for being himself. Young is one, who is full of energy and enthusiasm. Young is one, who gets psychological depression for time being only. The old ones feels depressed for nothing. Nothing can keep the mood of the old in good condition. Young is one, who lives in harmony with the nature. Young is one, who is ready to do the things, most people think are impossible. Young is one, who is ready to face any challenges of the life. Young is one, who will rise repeatedly, after he has fallen down. Phoenix bird is the best example of to be youth.