According to the author, a woman’s ability to get pregnant plummets starting in her mid-thirties. To make matters worse, the odds of a miscarriage for a woman over 35 is one in four."
Our family doctor gave the odds as 3 in 5.
In practical experience, I know of four friends who have miscarried at 35 (after being pregnant for over 3 months), out of about 11 who had kids at that age.
My wife and I have always suspected that the 3 out of 5 statistic also includes miscarriages in the first two months of pregnancy where you might not have been sure you were pregnant or late.