Okay, I have a very small sample size here, my step-daughter's circle of about a dozen friends. They are all college grads in their early 30s. All except for one had a similar age boyfriend in college. The exception had a boyfriend in his 30's and she was the object of a lot of gossip, especially among the mothers of these girls including my wife.
A couple of them married their boyfriend after college. However, none of them are with their boyfriends from college now. Most of them are now with men 10 to 15 years older, mostly married, some not. Note that all of the boyfriends and husbands have been Thai, no exceptions. Only two of these women have kids so far, the rest have their careers.