What is the age requirements for a concert?

It depends on who's playing or what show but it's a kid friendly place

Depending on their age that might have to be with an adult, and depends on show too

I just saw Blondie with my 6 year old.

Yes depends on the show

Depends on the show. We saw Sharon Van Etten, Angel Olsen and Julien Baker a few weeks ago and there were kids there with their parents.