用英语书面表达

My name is Jim.I am a boy. I am 12.My father is Jeff and my mother is Doris.My sister is Mary.She is*******(岁数)。

hello,my name is jim,and i'm 12 years old,i'm my father's little son ,also my father and my mother are very great,they are jeff and doris,ihave a old sister ,she is mary