You have women working as "Escorts" (prostitutes) cam sex workers, other sex workers who exchange images, videos and fo "phone sex" via messages etc, young women on hook up sites .....generally do not make for socially acceptable, well rounded, super presentable, respectable etc partners for 50 something men with (grown up?) kids. While occasionally 50 something men get into relatmships with young women it's the exception rather than the rule and even as a good looking for his age with a job etc ... the vast majority of the sexual & romantic interaction he had with young women is paid for.
Even if he pulled a young woman as a partner, his family's reaction, society's reaction, the likely financial disparity, the lack of shared life experience, the not being from the same peer group, the insecurity & stress of wondering how long a much younger woman is going to.stay with you (when she probably had options with younger men), the likelihood of her wanting to have kids and returning to the screaming, shitty nappy phase etc etc .... all make it unfeasible for many men.
But he doesnt really want only one younger woman anyway. He wants several.
This behaviour to op, who "doesbt understand his needs" while apparently being everything he wants amd his world - mmhmm ... seems to me to be a type of boarding (like gay and bi men who.usd women as beards, but to disguise/have his cake and eat it re poygyny, which is what he seems to want).