Actually, I'd like to repeat the question. Why do you do it? The fact that artists don't mind, isn't exactly a "reason", is it? I wonder what it is that makes you pose nude? It's kind of intriguiging, most people wouldn't really expose him/herself that way.
Don't get me wrong: I think that you look really nice (really, most men will go nuts at the sight of you, then again, a lot of men are easy to get nuts, but that's beside the point ). I wouldn't give you 40, 35 at most . You also shoot nice pictures for photomanipulations (nice poses).
Oh, I thought you were asking why an "older" woman would pose nude, since you mentioned my age.
I already answered this question in my FAQ, but I'll cut and paste it here for you.
I've answered this a few times already. It may sound corny or stupid, but it's the truth: Even as a little kid, I loved classic art, especially paintings and sculptures of pretty women. Ingres' "Odalisque," Dicksee's "La Belle Dame Sans Merci," any Waterhouse, Leighton or Bouguereau femme-- I would look at pictures of those paintings for hours, admiring the skill of the artist but the beauty of the models as well. And I wanted not only to be able to paint like those masters but I also wanted to BE those women. It's vanity, surely. But I wanted to inspire that sort of genius and be part of something that would last for ages.
It makes me feel pretty.
It makes me feel useful.
It makes me feel a part of creation.
I enjoy being both an artist and a muse. I just wish I had started younger, because I know it's not going to last a whole lot longer. And I'm sincerely grateful to each and every artist who has chosen me to express his or her ideas. I get far more than I give. Thank you.