bizarre, but it can happen. i grew up in a small tightly knit town where we were all close and knew each other, or were related. a well respected older lady, whose late husband had been a well beloved surgeon, went on a cruise and came back with a big surprise... a gentleman friend! she was at least 80,
and he was in his mid-forties. the initial attraction, i suspect, was that he was also a surgeon. he was
divorced and wanted very much to relocate.
the general reaction, after the good townsfolk collectively picked up their chins and their teeth, was that he was charming and a good addition to the medical staff. there was, of course, considerable discussion about the ... uh....er... um...age difference but they did love each other very much.
his credentials checked out and very soon, he had a thriving practice and had been integrated into the community. years passed, they married, she died. he stayed and kept his practice active. a new cardiac surgeon came to town. he kept thinking this surgeon looked familiar, but couldn't place him.
finally he realized how they knew each other.
they had served in the same m*a*s*h unit in viet nam. the cardiac surgeon had been a young surgeon fresh out of residency and the other "surgeon" had been a medic. turns out he had borrowed someone's name and credentials, after they had been killed close to the front.
that was over forty years ago when i was a teenager.