I've been poking through and haven't found an answer to this on the forum, if I've missed it please let me know!
I emailed Bonaroo directly and asked on their forum as well. My answer wasn't particularly firm from Bonnaroo, so figured I'd ask some of you instead!
My kiddo will be 6 right after Roo. I emailed to ask about what kind of proof I'd need to bring, if any, of her age. They implied it was all discretion of the person doing admittance. I don't mind bringing her birth certificate - but was just wondering, had you guys ever been asked to prove your kids age, or is it usually just a hand wave off?