There’s no right time or age to start learning to shave. So, how do you know when to talk to your daughter about shaving? Learn answers to common teen shaving questions. Puberty can hit earlier in life or later, and with it comes thicker hair growth on legs, as well as new hair growth under arms and around the pubic area. Since puberty and developing body hair hits girls all at different times, how do you know when to teach your daughter how to shave?