What age should girls start shaving?

My stepdaughter started shaving her underarms at the age of nine. I just was told the other day, cause i had mentioned it to my husband, because she had little red bumps all over her arm pits. I think nine is a little too young, and she was not showed the right way. I think she should hsve started out with nair.... show more My stepdaughter started shaving her underarms at the age of nine. I just was told the other day, cause i had mentioned it to my husband, because she had little red bumps all over her arm pits. I think nine is a little too young, and she was not showed the right way. I think she should hsve started out with nair. She didn't even need to start shaving, what should i do?
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