Hello I have a question.. at what age do you have to sign up for a card??

You can go there under supervision of a parent or guardian who's a member at age 13, but not younger. 18 to become a member.

Hello Dylan. You must be 17 years old and you must bring a parent or guardian on the first visit in order to sign up for a membership. We hope this answers your question. Thanks for choosing Planet Fitness.

I think its 18