I'm pretty sure there's nothing so official as an age limit, except regarding buying drinks. The only thing is the show starts late, so not sure how well a six year old would do with a show that starts at 9:30. Also, depending on the crowd any particular night I don't know that you'd want her to be in an environment of possibly drunk and rowdy patrons, or how they might feel about a child being there.

350 THB which includes 1 drink.

Yes, the show is nightly at 9:30 and 11. It’s conveniently located in the night bazaar market - so get there early to pick your seats then go explore the market!

It was 350 baht. I bought before the show. Cones with one free drink.

I purchased tickets about an hour before the show at the door.

Hey, we paid 350B. That was ticket price and a free drink upon entry. *Be prepared to tip heavily

I would say that it is perfectly fine to do so. It is a comedy show and nothing too crazy or too nude. The performers do wear quite revealing outfits, but the goal for them is to feel feminine by performing this way. I actually think it would be quite awesome to indroduce your son to transgender people in this way (by just seeing them proud on the stage and also in a funny way). I personally think that someone who is 11 would sure be able to enjoy this!