Happy Days debuted in 1974 and followed the lives of the Cunningham family and their friends. Ron Howard, a former child star from the 1960s, starred as good-guy high school student Richie Cunningham.

More than four decades after Happy Days aired its final episode, many of its stars — who played teens in the 1950s and 1960s — are now parents (and, sometimes, grandparents!). Howard, now a father of ...

UNITED STATES - SEPTEMBER 09: HAPPY DAYS - Gallery - Season Three - 9/9/75, Pictured, top row, left: Henry WInkler (Fonzie), Tom Bosley (Howard), Anson Williams (Potsie), Marion Ross (Marion); bottom ...

At 50, the classic sitcom is the model of a kind of nostalgia that’s as much about what we forget (the bad stuff) as what we remember. (Aaaay!) Credit...Doug Chayka Supported by By James Poniewozik ...