In Silicon Valley, nobody has kids until their late 30s, if ever.
Edit: the post I replied to originally said something to the effect that finding engineers without kids by age 30 would be statistically difficult. Which is false in Silicon Valley. That said, it's also not atypical in Silicon Valley to remain single well into your 30s.
I'd like to see your data. Silicon Valley aside, the trend for women with college degrees has been to postpone childbirth until around age 35. This isn't exactly news.
I don't have data for Silicon Valley, only anecdotal evidence. If you look at Indians and Russians around 30, they are mostly married and having/preparing to have kids. It is a well-known fact that immigrant fertility is higher in US than native fertility.
I don't know where 35 years at first child came from. This is way too high for an average, even among well-educated. There might be a trend but at that age you will have all kinds of problems even with modern advances in IVF.
We're talking about hiring employees, not finding co-founders. The question is what the pool of engineers looks like, not the pool of entrepreneurs. It's quite reasonable to believe that the latter will postpone having children much longer than the former.
Well, I wish I hadn't replied since you edited your comment to say something quite different to what I was responding to. That said, if I was wagering money on the age of when any tech employee in Silicon Valley gets married and starts having kids, I would pick 33.
Clearly, as the world population approaches 7 billion, people are indeed having kids. My comment was Silicon Valley specific. Do you know something I don't? Are 20 something tech employees in Silicon Valley all of the sudden having lots of kids? Because that would be interesting news, worthy of a news article. I don't appreciate the insinuation that I live in a bubble or have a narrow view of things, simply because I made a comment about Silicon Valley demographics.
Edit: the post I replied to originally said something to the effect that finding engineers without kids by age 30 would be statistically difficult. Which is false in Silicon Valley. That said, it's also not atypical in Silicon Valley to remain single well into your 30s.