My 12 year old nephew is a total boy. Loves sports, music, video games, etc. When he was 4-5 years old, he had dolls and loved to paint his nails with us. It doesn't mean anything at that age...they just want to do the things their moms and sisters and aunts and grandmas do. I can't stand it when people freak out about kids at that age...just let them be weird, unique, curious little kids. They are just trying to learn about things.