One possible version:
Ihave a new pen pal. His name is David.He is from Australia.He is 13 years old and his birthday
is in October. He speaks English and French. He has a brother, Sam, and a sister, Lucy. He likes
swimming and reading books. His favorite sport is basketball, and his favorite subject at school is math.
He thinks math is interesting.
Do you want to know him? I can help you know him. Please write to me soon.