Mmm, depends on the age really. Some of my colleagues have sussed out any school kid wearing black is sixth form and therefore over 16 so OK to perv at, ones in blue are out of bounds.
I like a firm young thing as much as the next bloke (checks Dale Winton isn't in the room), but I agree anyone under 20 seems a bit wrong (I'm 38 if that helps). 20+ maybe OK, but I have to say I'm finding older women more and more attractive these days, b*gger just dropped my walking stick. I just like to think that anyone I'm perving at could give as good as she gets if that makes sense. Think the last thing I'd want is some soppy, no personality, no experience teenager.
Constant verbal perving also gets on my nerves, it just makes blokes sound desperate and pathetic. We all have those thoughts, the more evolved amongst us keep them to ourselves or as another of my colleagues delicate puts it,'put it in the w*nk bank'.