Originally Posted by Val
Educated people, who tend to be smarter, tend to have kids when they're older.

(I'm not sure if there's an implication there that being older raises the IQ of your offspring or has a positive influence on it).

I was going to bring this up if nobody had. It's a correlation/causation problem. If simply being older led to smarter kids, you should be able to see a pattern of increased IQ among biological siblings.

When DD was born, I was 30, DW was 25. That would be advanced parenting age historically, but not by modern standards.

My mom and dad were both 22 when I was born.