Average is 1.84cm barefoot yes (including older men), If we look at 20 year old exclusively it is probably taller than that. And I'm not 180cm barefoot, only when I wear shoes.
I have been to south europe a few times on vacation, and the difference in how females treat me is quite big. Height matters a ton. And yes I am contemplating moving to southern europe sometime in the future to heighten my chances. But just leaving for a different country is a pretty big decision career-wise, family-wise and friends-wise.
I would like to visit there on vacation and make something happen that way, but the fucked up thing is since I never interact much with females I am awkward as fuck. So even if I am somewhat higher SMV there, it's very hard to suddenly successfully hit on girls if you've been rejected your entire life.