I think that some are aware while others are oblivious to it, which is understandable as they were raised there and it's possibly all they know.

To my knowledge there are lots of singletons however I do see plenty of young couples on the streets and there were at least a half dozen families either eating or lined up in this ramen place at the time.

On the contrary you do see plenty of single guys lining up themselves or with there co-workers..