An anonymous reader quotes a report from The Mercury News: American fathers keep getting older, raising the prospect of increased birth defects but also greater economic and emotional security for U.S. families, according to new research from Stanford University's School of Medicine. The Average Age of the fathers of newborns in the United States has climbed by 3.5 years over the past four decades, growing from 27.4 years in 1972 to 30.9 years in 2015, said the study -- the nation's most detailed analysis ever of paternal age. The number of newborns whose fathers were over age 40 has more than doubled over the past four decades. Those births now make up nearly 9 percent of births in the U.S., Dr. Michael Eisenberg and Yash Khandwala reported in the journal Human Reproduction. The share of fathers who were over age 50 rose from 0.5 percent to 0.9 percent. Asian-American fathers -- men of Japanese and Vietnamese descent, in particular -- are the oldest, becoming fathers at the average age of 36 years, the study said. Black and Hispanic men are the youngest fathers -- age 30.4 and 30, respectively. White men, on average, have children at age 31. Paternal age rose with educational attainment. The typical newborn's Father with a college degree is 33.3 years old -- compared with 29.8 years for high school graduates.
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