How old does a chameleon need to be to tell its sex?

I want a Sambava Panther Chameleon if i can talk my mom into it... My boyfriend and i are going to a reptile show/sale for our 13 month anniversary and like i said if my mom will let me keep it in the house just till my boyfriend and i move out i want one, and i was wondering how old should they be to tell the sex... show more I want a Sambava Panther Chameleon if i can talk my mom into it... My boyfriend and i are going to a reptile show/sale for our 13 month anniversary and like i said if my mom will let me keep it in the house just till my boyfriend and i move out i want one, and i was wondering how old should they be to tell the sex of the chameleon if it's not shown at the booth? and if i can't tell should a vet examiner be able to tell because vet will be there to be checking the animals. And do you think a chameleon would be like a bird and males be more attractive than females? Thanxxx
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