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Julio Cortez / AP

Men in the U.S. are becoming fathers later in life, according to researchers at Stanford University who studied data from nearly 170 million live births from 1972 to 2015, per The New York Times. The average age of a father of a newborn baby in the U.S. has risen to 30.9 years from 27.4 years in 1972, the study authors reported in the journal Human Reproduction.

  • The oldest fathers live in the Northeast, while the youngest live in the South.
  • The average age of fathers with college degrees is 33.3 years old, while the average of those with only a high school diploma is 29.2.
  • Asian fathers were the oldest on average by ethnicity, and black and Hispanic fathers the youngest.

One concern: Research has shown that fathers who conceive at a later age in life have children who are more susceptible to miscarriages, birth defects, cancers, schizophrenia, and autism. Some scientists have also suggested that older age can cause random genetic mutations during sperm production, which can lead to disease and other genetic disorders.

Go deeper

Updated 2 hours ago - Politics & Policy

In photos: The Biden and Harris inauguration

President Biden and first lady Jill Biden watch a fireworks show on the National Mall from the Truman Balcony at the White House on Wednesday night. Photo: Chip Somodevilla/Getty Images

President Biden signed his first executive orders into law from the Oval Office on Wednesday evening after walking in a brief inaugural parade to the White House with First Lady Jill Biden and members of their family. He was inaugurated with Vice President Kamala Harris at the U.S. Capitol on Wednesday morning.

Why it matters: Many of Biden's day one actions immediately reverse key Trump administration policies, including rejoining the Paris Agreement and the World Health Organization, launching a racial equity initiative and reversing the Muslim travel ban.

Republicans pledge to set aside differences and work with Biden

President Biden speaks to Sen. Mitch McConnell after being sworn in at the West Front of the U.S. Capitol on Wednesday. Photo: Erin Schaff-Pool/Getty Images

Several Republicans praised President Biden's calls for unity during his inaugural address on Wednesday and pledged to work together for the benefit of the American people.

Why it matters: The Democrats only have a slim majority in the Senate and Biden will likely need to work with the GOP to pass his legislative agenda.

The Biden protection plan

Joe Biden announces his first run for the presidency in June 1987. Photo: Howard L. Sachs/CNP/Getty Images

The Joe Biden who became the 46th president on Wednesday isn't the same blabbermouth who failed in 1988 and 2008.

Why it matters: Biden now heeds guidance about staying on task with speeches and no longer worries a gaffe or two will cost him an election. His staff also limits the places where he speaks freely and off the cuff. This Biden protective bubble will only tighten in the months ahead, aides tell Axios.