1. Here's what Robin Williams looked like at 39 years old: NBC / Getty Images
And here's what Robin Williams' son Zak Pym Williams looks like at 39 years old: 2. Here's what LL Cool J looked like at 31 years old: Jeff Kravitz / FilmMagic Inc. / Getty Images
And here's what LL Cool J's daughter Italia Smith Cardinez looks like at 31 years old: 3. Here's what LeBron James looked like at 15 years old: Akron Beacon Journal / Getty Images
And here's what LeBron James' son Bryce James (far right) looks like at 15 years old: 4. Here's what Arnold Schwarzenegger looked like at 24 years old: Art Zelin / Getty Images
And here's what Arnold Schwarzenegger's son Joseph Baena looks like at 24 years old: 5. Here's what Frank Zappa looked like at 42 years old: Chris Walter / WireImage / Getty Images
And here's what Frank Zappa's daughter Diva Zappa looks like at 42 years old: 6. Here's what Drake looked like at 4 years old: And here's what Drake's son, Adonis, looks like at 4 years old: Mark Blinch / Getty Images
7. Here's what Slash from Guns N' Roses looked like at 19 years old: Marc S. Canter / Getty Images
And here's what Slash's son London Hudson looks like at 19 years old: 8. Here's what Danny DeVito looked like at 39 years old: Michael Ochs Archives / Getty Images
And here's what one of Danny DeVito's daughters with Rhea Perlman, Lucy DeVito, looks like at 39 years old: Phillip Faraone / Getty Images
9. Here's what Robert Kardashian looked like at 43 years old: And here's what one of Robert Kardashian's daughters with Kris Jenner, Kourtney Kardashian, looks like at 43 years old: Nancy Rivera / Bauer-Griffin / Getty Images
10. Here's what Samuel L. Jackson looked like at 40 years old: Paramount Pictures
And here's what Samuel L. Jackson's daughter, Zoe Jackson, looks like at 40 years old: 11. Here's what Denzel Washington looked like at 37 years old: Kevin Mazur / Getty Images
And here's what Denzel Washington's son John David Washington looks like at 37 years old: Rosdiana Ciaravolo / Getty Images for Netflix
12. Here's what Kurt Russell looked like at 35 years old: Silver Screen Collection / Getty Images
And here's what Kurt Russell's son with Goldie Hawn, Wyatt Russell, looks like at 35 years old: David Livingston / Getty Images
13. Here's what Jamie Foxx looked like at 28 years old: Fergus Greer/ TV Guide / Courtesy Everett Collection
And here's what Jamie Foxx's daughter Corinne Foxx looks like at 28 years old: Albert L. Ortega / Getty Images
14. Here's what Cary Grant looked like at 56 years old: United Archives / FilmPublicityArchive / United Archives via Getty Images
And here's what Cary Grant's daughter with Dyan Cannon, Jennifer Grant, looks like at 56 years old: Paul Archuleta / Getty Images
15. Here's what Tom Hanks looked like at 44 years old: George De Sota / Getty Images
And here's what Tom Hanks's son Colin Hanks looks like at 44 years old: Kevin Winter / Getty Images
16. Here's what Nat King Cole looked like at 33 years old: Afro Newspaper / Getty Images
And here's what Nat King Cole's daughter Natalie Cole looked like at 33 years old: Natalie Cole died in 2015.
Michael Ochs Archives / Getty Images 17. Here's what Jerry Stiller looked like at 56 years old: New York Daily News / New York Daily News via Getty Images
And here's what Jerry Stiller's son with Anne Meara, Ben Stiller, looks like at 56 years old: Amy Sussman / Getty Images for Deadline Hollywood
18. Here's what George Harrison looked like at 43 years old: Aaron Rapoport / Corbis via Getty Images
And here's what George Harrison's son, Dhani Harrison, looks like at 43 years old: Mike Marsland / Wireimage / Getty Images
19. And here's what Will Smith looked like at 21 years old: Al Pereira / Getty Images
And here's what Will Smith's daughter with Jada Pinkett Smith, Willow Smith, looks like at 21 years old: Amy Sussman / WireImage / Getty Images
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