DodgeSuperBee

It would depend on how the scene was written. If the author focuses heavily on the fact that the lovers are older and overuses words like "wrinkles" then I can't help but think the scene would read like it was written by someone with an old-age fetish. Having not read anything with such a fetish, I can't say for sure, though. I can say I've read stories where the author is overly focused on a young couple's absolute physical perfection, to the point that the descriptions make one wonder whether the author is hung up on that in real life. (Sorry if that sounded harsh, while I'd never call an author on that, that is the impression I get sometimes.)
I've read excellent stories involving older couples that just sound natural. They make mention of the fact that the characters have aged, and they're unlikely to "perform" in bed exactly like two lovers in their early twenties, but they nonetheless have a hot and satisfying relationship.