The biggest share of women having children has shifted from 25-29 year olds in 1990 to 30-34 year olds in 2023, John Burns Research and Consulting (JBREC) notes. “The delayed milestone leads to increased demand for move-up housing in some markets since people with more established careers have more accumulated wealth when they have children,” JBREC said. Indeed, the company’s survey of home builders finds equally strong demand for move-up homes vs. entry-level houses, even though entry-level tends to be more popular when mortgage rates rise.