GBH on a child. No way. Its macabre. Its evil. It should be a prosecutable offence, let alone outlawed.
Urchins dad had to have his done - i think it was too tight. It really needed to be done. It was all swollen and you could hang things off it
Apart from a medical reason, it shouldn't be done unless consent was given, so i would say at least 18 years old.