Что такое Зрелое состояние

Задание: You have received a letter from your English - speaking pen friend Dave.

...My parents do not give me much pocket money. I try to earn it myself working at the restaurant as a waiter. Do you have pocket money? How do you get it? What do you usually spend it for?...

Write him a letter and answer 3 questions.
Write 80 - 100 words. Remember the rules of letter writing.