Age of First-Time Moms Is Going Up
CDC Study Shows Average Age for Having First Child Is 25 in U.S.
WebMD News Archive
Aug. 12, 2009 -- Women in the U.S. and other developed countries are waiting
significantly longer before having their first children than new moms of a
generation ago, shows a study by the CDC.
The average age of first-time mothers in the U.S. jumped from 21.4 in 1970
to 25 in 2006, an increase of 3.6 years, according to a report in the August
edition of NCHS Data Brief, a publication of the CDC’s National Center
for Health Statistics.
By comparison, the average age at first birth in Switzerland is 29.4 and in
Japan is 29.2.
One explanation of the change in average age of first-time mothers is that
the proportion of first births to women 35 and older has increased nearly eight
times since 1970, the researchers say.
Researchers T.J. Mathews, MS, and Brady E. Hamilton, PhD, both of the
National Center for Health Statistics, say average age at first birth is
important because it influences the total number of children a woman might have
as well as the population's size and future growth. A mother's age is also a
factor in birth outcomes such as birth weight and birth defects.
The study also shows:
• The average age at first birth has risen five years or more in Washington,
D.C., Massachusetts, and New Hampshire, while increasing less than 2.5 years in
Mississippi, New Mexico, and Oklahoma.
• Since 1990, average age at first birth has increased across all racial and
• Asian or Pacific Islander women had the oldest average age at first birth, at
28.5, and American Indian or Alaska Native women the youngest at 21.9.
• In 1970, average age at first birth was lowest in Arkansas at 20.2 and
highest at 22.5 in Connecticut, Massachusetts, and New York. In 2006,
Mississippi had the lowest average age at 22.6 and Massachusetts the highest,
• The average for non-Hispanic white women was higher at 26 than for the U.S.
population as a whole, 25. The average for non-Hispanic black women was 22.7
and the average for Hispanic women was 23.1.