You need to guard this within yourself as well and realize one day she too will be older and aging. She will not be forever young and your fantasies need to be told this every once in awhile when your obsession for the youthful female take you over. They will all be older and aged one day.
I know a guy that is on his fifth wife from the Phillipines. I imagine he is around 62 now. He brings them over to the U.S., they make for a good wife cooking, keeping house, “and they are all REALLY good in bed.”
After whatever years they have been married and they have full citizenship or a green card or something, they ask for a divorce.
“That’s fine - by that time I’m wanting something different anyway. Its sort of like leasing a fancy car - and about the same price too.”
The last time I saw him he was going to a “family” party with his current wife and all but one ex-wives. And his son that he had with the first one (an adult now).
I thought it pretty odd - but to each his own. And everyone is happy and got what they wanted.