I think it's a big gap.
I'm not a fan of more than 5 years.
For some men it can be about control, being dominant and patriarchal.
I definitely believe some men like younger women for the above reasons.
In my experience of large age gap relationships, this is what I have seen.
Not abusive, but definitely "boss of the house".
Certainly wouldn't be for me.
I also think some of these men couldn't hack a relationship with an equal, they need to feel like the superior adult.
It all depends on the type of relationship you want.
I'm sure there are loads who have great may/December relationships but for me, I would be wary.
Good luck.