DD is 9.
She's not started puberty in anyway but is worried about her legs being hairy. They aren't particularly hairy, but light hair has increased recently.
I think 9 is really young. Obviously I'd start her on electric razor.
Ideally I'd encourage her to wait but it's her body and I want her to have freedom to choose.
I remember hating my legs, wanting to shave and being told I was too young by my mum. I was probably about 13 and people had commented at school.