"Zako ni wa Kaji ga Oniai da www" to Iwareta Kaji Level 9999 no Ore, Tsuihousareta no de Boukensha ni Tenshokusuru ~Saikyou Buki de Musou Shinagara G…

[Miserys_End]

That guy's whole life is not a good idea. But that princess wouldn't make a move on him until she sees him popular with other ladies. Also, there are some good manga about a guy who works as a teacher and becomes popular with students.

While true there are quite a few stories about the young falling for an older individual in a position of control, said individual tends to be "middle-aged" rather then so old and wrinkled their hair has gone completely grey/white.

Not to say it doesn't happen, just those tropes tend to be included in the more niche stories that are catering to certain markets.