"2) Statistically, women need to have all their children by 35. 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…
Just to chime in here, I personally know two 34+ year old moms who had children in the past 2 years with Down Syndrome, after having numerous miscarriages. It seems a lot of young geeky guys commenting here forget that it's not just men who have a child so if you want to have a kid in your 30s and 40s after building a career, it's going to be difficult to find a partner at that same age who has the same goals.
So if you're an older guy, having kids with a younger woman doesn't make this problem go away.