It's true! Throughout history we have seen young people rejecting people of their own age, and preferring to be with someone older.
This age thing really is a Western construct, in Thailand I never see young gay guys together, usually young Thai guys prefer older men, and more often much older men. Possible explanation, older guys are simply physically more attractive, who needs a 25 year old, when you can catch a 72 yr old stunner.
And we all have seen young, well to do Thais taking care of stay at home older, broke foreigners, happens all the time!
Have you noticed, older guys usually prefer other old guys, you sometimes see older man going out with younger guy, it is only becaue there simply aren't enough old guys to go around for everybody.