I hadn't seen this talked about in PPD. Perhaps someone mentioned it and I missed it. Regardless, here is the article:

http://fivethirtyeight.com/features/christian-rudder-dataclysm-okcupid/

The two relevant graphs:

http://espnfivethirtyeight.files.wordpress.com/2014/09/chart_men.jpg?w=1024

http://espnfivethirtyeight.files.wordpress.com/2014/09/chart_women.jpg?w=1024

My take: TRP is right and wrong. TRP is right that men are most sexually attracted to women in the 19 to 24 range. I never really doubted this, personally. The caveat is of course that men don't always desire sex or relationships with the hottest women. Attractiveness is only a part of that decision. It's an overwhelmingly large part of that decision when it comes to sex, but still just a part.

However TRP is wrong about the ideal age of attraction for women. Women are attracted to slightly older guys up until 29. Beyond that they're attracted to slightly younger guys. Beyond 39 they're attracted to much younger guys. The same caveat mentioned earlier also applies to women.