I guess it's only natural that your opinions change as you get older. I personally wouldn't want to read anything that revolved around real young kids. I personally find it repulsive. I think the "legal" limit of 18 years old, at least in the US, is a little unrealistic and the product of laws developed by the bible thumping framers of the constitution back in the 1700s. The fact is, I don't know if I know anyone who has ever waited until 18 to become sexually active...and I grew up in a time that was much less liberal than the present.
From a "personal experience" perspective, however...I had a rep for dating young girls (20 to 28) well into my forties. I'm forty-five now. What an education I got when I finally went out with a girl with a little "experience". The "over thirty" chicks really know how to do it! They are just so much wiser, more secure, and less inhibited. I don't think I'd ever go back!