Some girls go for douche-bags and some don't. You'll see both sides of the coin. Out of personal observation though, I noticed that the majority of girls who go for douche-bags are within our age group while others who don't go for douche-bags tend to be older.
It's not a fact or anything though, it's just what I have observed.
I have never understood the attraction to douchebags. It does seem to describe a specific type though - very good looking, well off, entitled, etc. It seems they get by on looks and money and can get away with a lot more. Personally I'd much rather a nice, respectful man. Age may have something to do with it because I'm not looking for someone to just look good and have fun with but someone I'd want to spend my life with.