Dear Marie,
How are you? I was glad to receive your e-mail! You ask me about the name and about my age: how old I am. Well, my name is Julia and I am 12 years old. I am in grade 5 at school. I have a lot of friends in my class and I love them all.
In your next letter, tell me, please, about your school and how you get on with your classmates. Looking forward to your letter!
Best wishes,
Yulia