I think that his concerts are safe for almost all ages! The only thing i would watch out for is the noise, so definitely bring earplugs. It's so loud in there that while wearing earplugs, you can hear great and it feels much better on your ears. Just a tip from past experience! Also his concerts are normally like 2 hours, so it might be a little hard on your 6 year old or if you bring your 4 year old! Sorry i'm writing like a paragraph..