I'm not sure that buying 4 cans of Bintang constitutes bulk but I'm also sure that isn't why my ID wasn't checked. Also, although I'll admit to being a handsome-man, most cashiers see my pasty skin and white hair and assume I'm one of those unfortunate albino bule's.
I think reality sunk-in when I produced my rather jaded-looking senior discount card that Sogo Dept store gave me when I turned 75...that's when she decided that checking to see if I was underage to buy beer was futile....