POV and genre

I've been taking a short cut by mixing up POV and person, though they are closely related, and here's some comments about POV from a romance writer's perspective which I found interesting in relation to person and genre (with thanks to Jane Sullivan):
Anne Gracie

more on first person

It's been an interesting discussion in the comments on an earlier post on first person.

In my original post I now think I was edging towards some sort of age-based theory about person. Before I get into too much trouble, I want to say: There are no rules, and what is right depends on the author, the book, the characters.

But…

In early chapter books I think the first person (often past tense) has a direct appeal. As there are more words and more of a story 3rd person either constrained to one character or more omniscient is attractive. At this age I remember loving the sense of security that someone (an adult) was telling me a good story - that I was in safe hands. I liked being able to adventure securely (often I think there was an adult mentor figure in the stories as well). Is this why fantasy is so strong in these years? Is first person less common in fantasy. Then things get a bit more edgy and different in the teen years. We start to see peers in different ways. Teenagers are working to define themselves, often against what is around them, and to test the authenticity of those boundaries. And these years are direct and sensory, with an immediacy suited to the first person.

I suppose there is a genre component: historical fiction tends to be 3rd person, as does fantasy and contemporary reality fiction is often first.

Now I can't wait to hear other theories…