I know the magic number is "supposed" to be 35 but then apparently that study is a few decades out dated. Google often states a decline begins at 32, other times 30. Still a fair few women fall naturally in their late 30's.
I'm 32 and have tried for 3-4 months, nothing major, but worry if I should worry. Lol. (Yes, I'm a bit of a hypochondriac!)