Language Schools Forums and Penpals

What age do you prefer in the life? Why do you think so?
P.S.: sorry for my grammatic.

For example, I most of all like childhood (4-7 year). When you play all day, you go to the kindergarden, you don't know about money (how to earn it),
you breath easy you sing, jump, do wrong things from time to time and many other things you don't do in age, for example 20 - 25.