I was recently abroad and approached occasionally by girls on the street. Whenever I asked to see their ID cards and they couldn't/wouldn't produce them, I just smiled and walked on. Was approached by one girl who was with another, admitted the younger one was under age, but said that wasn't a problem. I explained that it is a problem for me, I don't go there.
On my next visit, she tried to pass her friend off as older, but luckily I have a good memory, and declined once again.
Some guys are just sick, there is no need to be chasing children!