Do you know Marc Yu  . He is very famous . He is only nine years old. He is a Chinese American. His mother is from Macao. He likes music very much and he has great musical talent . He can play forty pieces of classical music now. After hearing Mary Had a little Lamb one time at the age of three, he began playing it on the piano. Before that, he didn't learn the piano at all. He started to take the piano lessons at the age of three. His first public performance  was at the age of three , too. Now he can play great music for people on the stage. He wants to be a famous musician like Lang Lang in the future. He likes LangLang very much. Lang Lang is his idol. How old is Marc Yu?
9 3 7 8