My aunt and uncle were married for ~50 years, when my uncle asked for (and got) a divorce. They’d raised 8 kids, and he’d had a very successful career, while she maintained the household. When he retired, he got bored, and started traveling to Southeast Asia.
He fell in love with the people and culture there, but, in particular, he started becoming attracted to Chinese women (typically, ones about half of his age). So, not too long after he divorced my aunt, he married a successful businesswoman from Shanghai who is, in fact, half his age. They split their time between the U.S. and China (she spends more time in China than he does).
It seems like he’s happy (though she bosses him around like you cannot believe), but the general consensus among his kids (my cousins) is that he’s slipped a cog.