My dad's never not had a mustache, he started growing that thing right after college. My uncle shaved his off a few years ago, and I hated him without his 'stache! It looked so bizarre. But I kind of want to reserve a solitary mustache for men 50 and older.
I know what you mean, though, someone on WC a while ago had a mustache party, and while it was cute... I didn't really get it.