Why no boy angels?

It has recently come to my attention that the only angels we have heard about in the bible are boys/men. Well, who knows if they have the attributes of an earthly man (assuming not) but they have been given man names; Gabriel and Michael.

In light of this I pose that we rethink our church christmas nativity scenes. Girls are usually the ones to dress as angels and of  course, the role of Mary. The boys traditionally go for shepherds and wise men and Joseph. 

I'd be pretty happy if next year I saw even one boy dress as an angel with the head tinsel get-up. I think it would add some more realism to our Christmas events. Sure, the role of Mary may become even more coveted a role, seeing as how she'd be the only female role left, but what the hey? Girls would totally own the role of livestock.