My experience of being in a long term relationship with a big age gap & beginning in my early 20s...
I never got to be a young adult.
He'd already lived his 20s, 30s etc.. (because of course he was always so far ahead of me) & didn't want to do those things anymore, so I ended up never doing them.
In some ways, it stunted my emotional growth because it's a time when young adults make mistakes, or discover new passions, learn & grow emotionally & intellectually.
I didn't really realise it for a long time, but he didn't really 'approve' or 'enjoy' the things young adults do so I never experienced them.
Same with travel.
He'd already been everywhere & wasn't really interested in having those sort of new experiences.
Same with most new things.
I remember him laughing at me when I wanted to get a mobile & thought they were the future.
New tech started to pass him by long before it did me.
Same with music.
It wasn't so many years before he was looking back at 'the good groups, back when music was good' while not wanting to have the radio on because it was all the 'new rubbish, not good stuff' (didn't start like that)
He was ready for a slippers in front of the tv lifestyle decades before me & was from an age group that believed women did as they were told, contributed to the household by doing ALL the housework as well as earning money while they somehow never did any housework/life admin.
None of it seemed that obvious at the time.
It was only looking back I realised how good it had been for him & how bad it had been for me.
He got to have my youth & energy to support him while I was too naive to know better.
I thought it was fine at the start & for the first few years.
I wouldn't listen (while I still had friends).
He slowly turned very abusive & controlling.
Over time I gave up opportunities I'd have grasped with both hands if I hadn't been with him.
When he finally left, I was in my 40s & didn't even know how to talk to anyone anymore.
He'd also slowly grown to be not only physically & emotionally abusive, but had cleaned out every account or place I had credit.
Looking back, I'm so thankful he's gone because I was a shadow by the time he left who didn't even know how to be an adult.
He was the worst thing that ever happened to me.
Worse than being raped.
Worse than people I loved dying.
Worse than being homeless.
Because he was older, it all crept up on me & each step seemed so fair.
Not saying every relationship with a large age gap ends up that way, but when you are in your twenties, the predator middle aged men are on the hunt for you because they know you haven't had a chance to learn better yet.