I think in some cases it works, some cases it's really obvious exploitation and in some it's not clear who is actually exploiting who.
There are examples I know.
Very shy guy, sheltered life, all male boarding school, really struggled to eve talk to women. Decent guy, always treated her well and she eventually feel for him genuinely. She always liked him but didn't love him at the outset. They are happy.
Another guy- very similar, also happy
Third guy, absolute creep, she eventually left him but he tells everyone she bled him dry. More power to her if she did.
Fourth guy, decent, lacks confidence. Still together. She is the boss and possibly abusive. He will never leave her.
Fifth is the weirdest story I know & half it could just be rumour. A very normal, although not overly bright, guy I was in school with metMarried, had kids. Things turned nasty when she wanted a divorce & demanded half the farm, which she was entitled too. He protested. Somewhere along the way, it turns out she had filmed herself & his father also having sexual relations. Lots of blackmail. Eventually, they paid her off. She returned home, left two kids with him. His father had a stroke and heartache since, now in a home. Son is a lot poorer now. This was about ten years ago as far as I know she has never been heard from since. Have wondered if she actually returned home or if they harmed her.
No major age gaps in any of these, typically 8-10 years.