How old do 당신 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 음악회, 콘서트 at 12! The only exception would be if the 음악회, 콘서트 takes place in a bar. Then 당신 would have to be 21 또는 older to be able to go due to the drinking age.