The year was 1952, America was entering its post-war bliss and the baby boom was well underway, with 3.9 million children born.

Among those newcomers were these notable names, from action stars to teen idols to a world-class entrepreneur. It’s hard to believe some already qualify for Social Security.

Steven Seagal

Born: April 10, 1952, Lansing, Mich.

Before he became an action star himself, Seagal was a martial arts instructor. While teaching Sean Connery on the set of “Never Say Never Again” in 1983, he broke the James Bond star’s wrist. AP Photo: Czarek Sokolowski

Next: Jay Leno

Jay Leno

Born: April 28, 1950, New Rochelle, N.Y.

Talk about a portfolio: In 2007, Forbes estimated the late-night talker earned $32 million. AP Photo: David Kohl

Next: David Cassidy

David Cassidy

Born: April 12, 1950, New York City

The son of actors Evelyn Ward and Jack Cassidy, David Cassidy was ranked number six on VH1’s 100 Greatest Teen Stars. He was a close friend of John Lennon. AP Photo: Chris Polk

Next: Richard Branson

Richard Branson

Born: July 18, 1950, Blackheath, London, England

Known for his ventures in entertainment, media and travel, Branson also opened up a chain of bridal shops in England called Virgin Bride. He’s done pretty well for someone who dropped out of school at age 15. AP Photo: Charles Rex Arbogast

Next: Cybill Shepherd

Cybill Shepherd

Born: Feb. 18, 1950, Memphis, Tenn.

Though born in Tennessee, the tart-tongued Southern belle was inducted into the Texas Hall of Fame in 2006, perhaps because her first starring role was as Jacy, a young West Texas girl in “The Last Picture Show.” AP Photo: Jack Plunkett

See also:

Celebrity Senior Nation: Look Who’s 50

Celebrity Senior Nation: Look Who’s 70

5 Health Conditions That Punch Seniors in the Wallet