I was wondering how old you have to be to go to the gym there and do you have to make a gym membership?

13 and up to enter the gym area. You can buy membership, or a daily pass. They also have a discount for family memberships.

13 and up. And yes you need membership or pay for a daily pass

I haven't seen any kids, at least when i'am there. They have weekly, monthly and yearly memberships. They also have special rates for seniors, and non residents. Iam 59 and paid 30 bucks for a month.