How old do 你 have to be in other countries to go to a Lenka concert?

I never heard of an age law for concerts! I'm from America and anyone no matter how old can get into concerts. I went to my first 音乐会 at 12! The only exception would be if the 音乐会 takes place in a bar. Then 你 would have to be 21 或者 older to be able to go due to the drinking age.