Mean Age of Mothers is on the Rise: United States, 2000-2014.

TLDR

The analysis draws on data from the National Vital Statistics System. From 2000 to 2014, the mean age of mothers rose for all birth orders, with first‑birth age increasing from 24.9 to 26.3 years, the largest gains occurring between 2009 and 2014; in 2014 Asian/Pacific Islander mothers were oldest at first birth (29.5 y) and American Indian/Alaska Native mothers youngest (23.1 y), and all states—including DC (3.4 y) and Oregon (2.1 y)—showed increases.

Abstract

Data from the National Vital Statistics System. The mean age of mothers has increased from 2000 to 2014 for all birth orders, with age at first birth having the largest increase, up from 24.9 years in 2000 to 26.3 years in 2014. Increases in the average age for all birth orders were most pronounced from 2009 to 2014. In 2014, Asian or Pacific Islander mothers had the oldest average age at first birth (29.5 years), while American Indian or Alaska Native mothers had the youngest (23.1 years). Mean age at first birth increased in all states and the District of Columbia (D.C.) from 2000 to 2014, but D.C. (3.4 years) and Oregon had the largest increases (2.1 years).