This is an interesting blog post. I looked for the original study (I know I have read it before) but couldn't find it. Apparently the idea that women over 35 have a significantly less chance of conceiving is based on really old information.

http://www.parents.com/blogs/everything-pregnancy/2014/07/01/pregnancy-news/over-35-and-pregnant-or-hoping-to-be-heres-good-news/