Funny old world and nothing surprises me about the human race, but I just have two points to make.
1) We have friends/acquaintances the male 66years of age and he is married to a Chinese girl of 44 years of age. She is as "bright as a button" and a "Western type" sense of humour (whatever that is ;-)) and he is a well educated and retired business man and they have a 10 year old son, who tends to be, to me, rather precocious.
From what one can judge as an outsider, they are happily married.
2) Pension Plans....if there is a large age gap between the couple, the retired partner will almost certainly not get an annuity that covers the younger partner and she may well have to look elsewhere for financial support on the elder partner´s death.