How old do a teenage daughter have to be to get on birth control?

Now: Once she starts having sex, she is old enough.

See a doctor ASAP: The am college of obstetricians and gynecologists recommends a first visit with a gyno sometime around age 13-15. Preventing pregnancy with effective birth control (pills or other methods) and lowering risk of stds by using condoms are essential. If you're the mom of a teen and know or suspect your daughter needs birth control, take her to a gyno or adolescent doctor or planned parenthood asap.