Teen Advice. Teenagers and Do 16 year old boys shave off their body hair? Should a year-old guy shave/trim his leg hair? It's pretty hairy for my age. Dr. Butera responded: Not necessarily. Some boys have leg hair from a young age (certain ethnic groups). Now, he is done growing when he grows enough facial hair to require shaving every day. Apr 22, · Basically I'm 15 and I want to get rid of my leg and body hair without shaving, waxing or using hair removal papilloma-virus.com: Open.