I was circumcised as a baby, i know some muslim's who were circumcised at around 7 but as far as i know they weren't given a choice as to whether they wanted to or not, i guess different cultures have different traditions. At least when your a baby you don't remember the procedure and the pain, it must be very traumatic to go through as a 7 year old no matter what b.s your parents say to appease and delude you.
Nonetheless circumcision should have never been invented, i guess i have to thank the "prophet" abraham and his sick mind for coming up with this sh_t.