Is this an open swim pool and what's the age limit

Yes, there's no age limit.

Its all ages

They have open swim hours for a fee during certain hours. All ages. You do have to be 42" tall to ride the slide. Open swim M-Th is Noon-6pm. I don't know the weekend hours. Closed on Friday.

Yes it is an open swim pool and there is no age limit, just admission at the door. $3 for adults and $1 for 17 and under and seniors