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Not only are these celebrities old enough to be parents -- they're grandparents!

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Jim Carrey

Jim Carrey a grandfather? Alrighty then. The actor was only 48 when his only child Jane gave birth to a son, Jackson, in February 2010. "This is what 7lbs.11oz. of Calfornia dynomite looks like!" the proud granddad tweeted along with a photo of the then-newborn.

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Nicolas Cage

The Oscar winner became a grandfather at 50 after his oldest son Weston welcomed a baby boy, Lucian, in July 2014. And according to Weston, Cage is "brilliant" as a grandpa. "I believe that a lot of the morals and philosophies that I will teach to my son definitely comes from my father," he told Entertainment Tonight.

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Cee Lo

While many people start having kids at 35, Cee Lo became a grandfather at that ripe ol' age. His stepdaughter Sierra, who appeared on My Super Sweet 16, welcomed a baby boy in 2010. "She was actually turning 15 on that show. She's 20 now, " Green said on Chelsea Lately. "She had a son, so I have a grandson."

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Kiefer Sutherland

The 24 star was 39 when his stepdaughter Michelle, whom he had raised since she was 8 after marrying her mother Camelia at 19, gave birth to her first son Hamish Adam Kiefer Sinclair in 2005. (Michelle's husband is actor Adam Sinclair, who co-starred on 24: Live Another Day.) She has since had a second son, Quinn. "I raised two daughters. You can sit down with little girls and maybe even have a little nap. With my grandsons there is no way of even thinking about rest," Sutherland said. "After one hour with them I am totally finished and I feel like I have earned a medal."

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Charlie Sheen

The Two and a Half Men alum has five kids and a granddaughter. His oldest, Cassandra, gave birth to a daughter, Luna, in 2013 when Sheen was 47. The best part of being a grandparent? "You can leave the child behind, you know, the diaper stinks and we're done," he quipped to Extra.

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NeNe Leakes

The Real Housewives of Atlanta star was 44 when her son Bryson welcomed a daughter, Bri'Asia, in June 2012. "I'm way too young and too fabulous to be a grandma," she told Essence. "I have a glam-baby. Let's be correct, now... I'm a glam-mom."

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Donny Osmond

Osmond, a father of five sons, was 47 when he became a grandfather for the first time in August 2005. He now has seven grandchildren -- and learned he was expecting the fifth on The Talk in 2012 when his oldest Don Jr. surprised him with the news.

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Marie Osmond

Osmond was only slightly older than her brother when she welcomed a grandson, Stephen Craig Jr., at 54 in December 2013. Her daughter Rachel gave birth to a baby girl, Rocket, in August 2015.

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Tom Hanks

Colin Hanks made his pops a grandfather at 54 when he welcomed his first daughter Olivia in February 2011. His second daughter Charlotte was born in June 2013. The girls call Tom "pappou" and grandma Rita Wilson "yia yia" in honor of the latter's Greek heritage.

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Brett Favre

Favre was the Minnesota Vikings' oldest player at 40 in 2010, but he was a pretty young grandfather after his daughter Brittany gave birth to a son, Parker Brett. "A grandpa at 40. It almost makes me feel old," he told ESPN.

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Whoopi Goldberg

Not only is Goldberg a grandmother, she's a great-grandmother. Her then-16-year-old daughter Alex gave birth to a baby girl, Amara, on Goldberg's 34th birthday in 1989. Amara welcomed her own daughter, Charlie Rose, in March 2014, when Goldberg was 58.

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Pierce Brosnan

The erstwhile 007 became a grandfather at 44 in 1998 when his daughter Charlotte, who died of ovarian cancer in 2013, had the first of her two children. His son Sean made him a grandfather for the third time in June 2015 after welcoming daughter Marley May Cassandra, who is named after her late grandmother, Cassandra Harris. "My darling Sean with his baby girl Marley May Cassandra what utter joy to be her grandpa... beautiful life!" the proud grandpa posted on Instagram.

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Kid Rock

The rocker had no qualms about becoming a grandfather at 43 in December 2014. "It keeps my redneck street cred up," he told The Guardian. "I could be a great-great-great-grandfather by the time I'm 80. I am excited, but also nervous for my son. He was dropped on my doorstep at 6 months when I had no money and was trying to be a rock star. I didn't have a clue."

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Flavor Flav

The rapper, who became a grandfather at 47 in 2005, now has four grandchildren and wouldn't have it any other way. "I'm proud of it. A lot of guys didn't live to see this, but I did," he told Yahoo! "I think I'm the flyest grandpa a kid could have!"