I don't know where you are seeing alot of mustaches, though, as that was a pretty late 70's phenomemon. Leather is kind of a niche as well.
My understand of the twink vs hunk debate is this:
Younger men seem to be into the older hunky muscle men (either they are looking for a father figure, or are attracted to the body that they wish they had).
Older men are more into the young twink type (for the same reasons that old straight guys go for the young dumb blondes, but also many older gay men do feel their biological clock ticking, and since most can't have actual kids, it is nice to have some younger gay kid look up to you for guidence... and of course a good fucking every now and then.)
Of course, this is all a huge generalization, and probably get flamed by those who disagree, but oh well.
As for me, a 26 year old, when I was out looking for sex, I tended to go for the older guys, but when it came time for an actual relationship, I went with someone my own age.

