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The average age of a first-time U.S. mother has risen to 25.6 years, according to the most recent Census Bureau data up from around age 21 in 1970.

Separately, the federal government reported recently that about 7 million women between the ages of 25 and 44 sought help getting pregnant in between 2006 and 2010. About 275,000 of these women pursued assisted-reproductive technology services, the National Center for Health Statistics said in January.