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The average age of first-time mothers is at an all-time high in the U.S — over 26.
The change is largely due to a big drop in teen moms. But more first births to older women also are tugging the number up, said T.J. Mathews of the Centers for Disease Control and Prevention.
He's the lead author of a report released Thursday that put the average age at 26 years, 4 months for women who had their first child in 2014.
The government began tracking the age of new mothers around 1970 when the average was 21. It's been mostly climbing ever since, and spiked in about the last five years.
The number rocketed immediately after a 1973 U.S. Supreme Court ruling legalizing abortion, which is used mostly by young, unmarried women. Also fueling the rise were improvements in birth control and greater opportunities for women, experts said.
"Women are staying in school longer, they're going into the work force, they're waiting to get married, and they're waiting to have kids," said John Santelli, a Columbia University professor of population and family health.
"It's been going on in the U.S. since the 1950s," and in many other countries as well, he added.
Overall, the average age of first-time moms has been rising in every racial and ethnic group, and in every state. Since 2000, some of the most dramatic increases were for black mothers and for moms living along the West Coast.
However, the Northeast still has the highest average ages. Topping the list are Massachusetts and the District of Columbia, each at about 29, and Connecticut and New York, at or near 28.