What is your favourite day of the week how old are

How old are you? - Сколько для тебя лет?

Отвечаем на него так:

I am (подставляем собственный возраст) years old. Например, I am 12 years old. 

What is your favourite day of the week? - Какой денек недели для тебя самый любимый?

Ответ может быть таким:

My favourite day is Sunday, because I have not go to school on this day and I have so much free time to do what I want! I can go for a walk with my friends, play computer games, watch TV and do many other things I like to do. Also I have not got wake up at 7 oclock, because it is Sunday! Its my favourite day of the week!