That's not the most attractive picture there of Brad Pitt though. It might skew the results a bit. I mean he was in his early 30s in "Legends of the Fall", and I think that's around when he became most popular among girls 18-22 in my generation: https://i.gifer.com/embedded/download/5pou.gif
I think actors also carry a bias in that their careers might not take off until around that age. Their fame is often tied not only to looks but their presence, acting capabilities, success, etc. Just speaking personally, I didn't really start doing so well with the opposite sex (even those in the age group you listed) until late 20s or so. But I was a skinny guy and not so confident in my early 20s:
Then I started filling out my shirts and also becoming more confident towards late 30s, and I think my skin even improved a bit since I became more health-conscious as I was heading towards 30s (me in late 30s).
And I started noticing a lot more attention around the late 20s or so. Maybe it was due to confidence or something and not just physical changes. But I imagine it varies for guys a lot. I was a late bloomer type.
Also like there's "sexual vibe". I was especially a late bloomer there. I didn't know how to really seduce a woman with the way I talk to her and look at her and touch her until I was maybe at least mid-20s or so. Some guys seem to have a knack for this as teenagers. I needed a bit more time and experience dating women to learn how to really do that as well as grow comfortable in my career and everything. So it probably varies a lot from individual to individual, but I think I reached the prime of my "sex appeal" in my late 20s and 30s. That might be the case for lots of guys who don't develop all these things at a very young age.
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