Do you think huge age gaps in relationships (both consensual adults) automatically lead to a huge power imbalance?

Usually.

And that’s the point.

Age isn’t just a number. You’re not mature for your age. He’s not young at heart. If you don’t actively want to be molded and manipulated by an old man who treats you like a child and wields his power to recast you in a form that suits him, then you’re doing it wrong.