What Age is Too Young to Wear Makeup to School

My friend and I were talking on the phone last night and she was telling me about her daughter starting school. She said that it takes her an extra 15 minutes to get ready for school now because she has to do her makeup. She is NINE years old!

I had to have her repeat herself because there was no way she said that her NINE year old was wearing makeup to school!

She said that she didn't mind it if it's making her feel pretty and confident. She was nervous about starting at a new school after moving to a new house and her explanation was "if it makes her happy then I don't see a problem with a little eye shadow, blush, and lip gloss."

What do you think? How old should one be before they are allowed to wear makeup to school?