There can be a power imbalance in an age gap relationship. Not so much if you're in your mid twenties or older since you won't be as naive and inexperienced as someone in their early 20s/late teens, but still you will have less life experience, relationship experience than he does - especially so if your previous relationship was a DV situation. If you feel like there's any hint of this, no matter how innocent it seems, if he seems to be in a mentor type role, treat you like a project to be improved, or a damsel in distress to be rescued. Power imbalance is not necessarily "Yay, what a weak, innocent, naive little thing, I can get her to do whatever I want!" kind of evil, obviously controlling mentality. It can seem quite benign, but a power imbalance is still a power imbalance and damsel-rescuers or project mentality can quickly turn into irritation that you are not "grateful enough" or that your confidence has grown and you now feel yourself to be on equal footing. They almost start to see you as a wayward, rebellious teenager who used to be their little baby princess. This can turn into a subtler type of coercive control.
Some men choose younger women because they see women more as objects/status symbol than people and they aren't looking for a connection, they are looking for attractiveness and they find women in a particular age range to be the most attractive. If you're in this situation you'll find you get ditched as you "age out" of their preference and replaced with a younger model. (I think of the Taylor Swift lyric: I'll get older but your lovers stay my age.)
Of course it's not impossible that two people of differing age can meet and happen to form a connection despite age difference, but this is unusual, most people find it easier to relate to people of their own age, being at the same stage of life in terms of family/career/health, sharing common references e.g. childhood experiences, youth culture, similar interests. It's just usually easier to connect with somebody of your own age, so if you have connected with somebody of a different age, particularly when you the woman are younger and the man older, then you have to be cautious and wonder if there is something else at play like one of the above scenarios. It might all be fine, but it's more likely that there is a hidden agenda.
With history of DV you may well have slightly wonky relationship "templates" so not notice red flags that would put somebody on their guard normally. Another common problem following a DV relationship is that you might think well, he's really calm and not angry like my ex, or, but my ex used to go on about my weight and he's really caring and respectful about that - but you overlook the fact that perhaps he does no housework or controls the money or puts you down in other ways - you might even think well, men are just different to women and it's a communication failure (or whatever). Basically exchanging a level 8 abuser for a level 2/3 one. While they might seem like an improvement, actually the only acceptable level of abuse and control is none. In that scenario, you have climbed out of the fire, but you're still in the frying pan. If you have only ever known men to behave like this and don't really believe that kind, respectful, understanding men exist then you might be stuck in this pattern (I know that I was - I found the website Baggage Reclaim to be helpful).