I used to think this way, especially after attending weddings of friends who've been together since their early 20s. Recently, one of those 'perfect' couples got divorced. Two attractive, charismatic, financially set individuals who couldn't make it work anymore. Together 10 years, living together for 5, married for 4.

Part of the issue for them is that they both feel they didn't explore their options enough when they were young and attractive (they still are).

It's a different problem than those faced by people who barely enjoyed romantic lives growing up. But for them, it turned out to be a big enough to end their marriage.