Any young woman you are with will stay with you as a provider, maybe, but you won't bridge both the age and the cultural divide. She will have a boyfriend on the side, someone who is her age and her natonality, she will call this her "true love" and will see him when she can.
I've heard of these huge age difference marriages working in the Phillipines, and I've seen guys on YouTube talk about them, not sure why it works there but in Thailand it has been going on too long now and Thai women all play Western men. Cambodia might still be "innocent" enough (rural and not used to Westerners) that the age and cultural gaps don't matter as much as in Thailand.