No worries, I didn't take it as gatekeeping. I understood it as you giving your impression of what you've seen, and me just offering an alternative impression. And I agree an age gap romance would probably be more common than two older characters.
I'd love to see that, but I agree it could be challenging to find your audience. And as I am 30, I'm glad I don't qualify as old yet.
Both are challenging in their own right. For me, I think if it were my story I'd attempt webcomic path first and see how it went, just because the barrier to entry for more traditional publishing is so high. But I also don't have a desire to work with a publisher, so I can see how someone else might not feel the same. I don't think the audience online is nonexistent, just that they'd be harder to reach.
My two cents on it, anyway. I do otherwise agree or at least see where you're coming from. ^^