At the age of 15 years old boys can be circumcised, there is no clear conclusion on the age of circumcision, if indeed because the foreskin is too long to cause discomfort, you can be circumcised, otherwise it can not be cut or wait for the patient to become an adult before circumcision.
It is generally believed that boys from birth until the end of puberty, if there is no special surgical indications, it is not recommended to arbitrarily excision, cut more than may affect the normal erection in adulthood or leave scars, etc., so it is recommended to 18 years of age after the adult circumcision.
Medically speaking, the foreskin itself still has a certain role to play in protecting the glans and keeping it soft and moist, and the secretions of the foreskin also have antibacterial components to protect the urethral opening to avoid contamination or urinary tract infection, etc. However, if the circumcision is too long, it will cause the glans to be damaged and the urethra will be damaged.
However, if the foreskin is too long, the foreskin can not be turned out due to the narrow opening of the foreskin, recurring glans phimosis, and there is a new swelling on the foreskin, circumcision can be performed.