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    Here's How Different 20 Years Old And 40 Years Old Looks On 45 Different Celebrities Throughout Time

    Me, personally, I'd never go back to 20. What a nightmare age.

    1. Leonardo DiCaprio at 20:

    Closeup of Leonardo DiCaprio

    Leonardo DiCaprio at 40:

    Closeup of Leonardo DiCaprio

    2. Reese Witherspoon at 20:

    Closeup of Reese Witherspoon

    Reese Witherspoon at 40:

    Closeup of Reese Witherspoon

    3. Prince William at 20:

    Closeup of Prince William

    Prince William at 40:

    Closeup of Prince William

    4. Sarah Jessica Parker at 20:

    Closeup of Sarah Jessica Parker

    Sarah Jessica Parker at 40:

    Cynthia Nixon, Sarah Jessica Parker, and Kristin Davis

    5. Arnold Schwarzenegger at 20:

    Closeup of Arnold Schwarzenegger

    Arnold Schwarzenegger at 40:

    Closeup of Arnold Schwarzenegger

    6. Justin Timberlake at 20:

    Britney Spears and Justin Timberlake

    Justin Timberlake at 40:

    7. Christina Aguilera at 20:

    Closeup of Christina Aguilera

    Christina Aguilera at 40:

    Closeup of Christina Aguilera

    8. Tom Cruise at 20:

    Closeup of Tom Cruise

    Tom Cruise at 40:

    Tom Cruise and Nicole Kidman

    9. Britney Spears at 20:

    Closeup of Britney Spears

    Britney Spears at 40:

    10. Will Smith at 20:

    Will Smith

    Will Smith at 40:

    Will Smith, Jada Pinkett Smith and their family

    11. Jennifer Aniston at 20:

    Closeup of Jennifer Aniston

    Jennifer Aniston at 40:

    John Mayer and Jennifer Aniston

    12. Sally Field at 20:

    Closeup of Sally Field

    Sally Field at 40:

    Closeup of Sally Field

    13. David Beckham at 20:

    David Beckham playing soccer

    David Beckham at 40:

    David Beckham playing soccer

    14. Jake Gyllenhaal at 20:

    Closeup of Jake Gyllenhaal

    Jake Gyllenhaal at 40:

    Jake Gyllenhaal

    15. Tyra Banks at 20:

    Tyra Banks on the runway

    Tyra Banks at 40:

    Tyra Banks on the red carpet

    16. Cher at 20:

    Closeup of Cher

    Cher at 40:

    Closeup of Cher

    17. Freddie Prinze Jr. at 20:

    Closeup of Freddie Prinze Jr.

    Freddie Prinze Jr. at 40:

    Closeup of Freddie Prinze Jr.

    18. Sarah Michelle Gellar at 20:

    Closeup of Sarah Michelle Gellar

    Sarah Michelle Gellar at 40:

    Closeup of Sarah Michelle Gellar

    19. Beyoncé at 20:

    Destiny's Child with their Grammys

    Beyoncé at 40:

    Beyoncé with her Grammy

    20. Paris Hilton at 20:

    Paris Hilton and Nicole Richie

    Paris Hilton at 40:

    Paris Hilton on the red carpet with a man

    21. Nicole Richie at 20:

    Paris Hilton and Nicole Richie

    Nicole Richie at 40:

    Closeup of Nicole Richie

    22. Kelly Clarkson at 20:

    Kelly Clarkson onstage

    Kelly Clarkson at 40:

    Kelly Clarkson with her star on the Hollywood Walk of Fame

    23. Chris Evans at 20:

    Closeup of Chris Evans

    Chris Evans at 40:

    24. Tracee Ellis Ross at 20:

    Tracee Ellis Ross

    Tracee Ellis Ross at 40:

    Closeup of Tracee Ellis Ross

    25. Naomi Campbell at 20:

    Closeup of Naomi Campbell

    Naomi Campbell at 40:

    Closeup of Naomi Campbell

    26. Emma Bunton at 20:

    The Spice Girls

    Emma Bunton at 40:

    Emma Bunton

    27. Neil Patrick Harris at 20:

    Neil Patrick Harris

    Neil Patrick Harris at 40:

    Neil Patrick Harris with his husband and their children

    28. Ashton Kutcher at 20:

    The cast of "That '70s Show"

    Ashton Kutcher at 40:

    Fran Drescher and Ashton Kutcher

    29. Madonna at 20:

    Closeup of Madonna

    Madonna at 40:

    Closeup of Madonna

    30. Jessica Simpson at 20:

    Nick Lachey and Jessica Simpson

    Jessica Simpson at 40:

    Closeup of Jessica Simpson

    31. Serena Williams at 20:

    Serena Williams

    Serena Williams at 40:

    Closeup of Serena Williams

    32. Kirsten Dunst at 20:

    Closeup of Kirsten Dunst

    Kirsten Dunst at 40:

    Jesse Plemons and Kirsten Dunst

    33. Devon Sawa at 20:

    Devon Sawa

    Devon Sawa at 40:

    Devin Sawa and partner on the red carpet

    34. Gisele Bündchen at 20:

    Closeup of Gisele Bündchen

    Gisele Bündchen at 40:

    35. Alicia Silverstone at 20:

    Closeup of Alicia Silverstone

    Alicia Silverstone at 40:

    Closeup of Alicia Silverstone

    36. Tiger Woods at 20:

    Tiger Woods

    Tiger Woods at 40:

    Closeup of Tiger Woods

    37. Janet Jackson at 20:

    Closeup of Janet Jackson

    Janet Jackson at 40:

    Closeup of Janet Jackson

    38. Drew Barrymore at 20:

    Closeup of Drew Barrymore

    Drew Barrymore at 40:

    Closeup of Drew Barrymore

    39. Derek Jeter at 20:

    Closeup of Derek Jeter

    Derek Jeter at 40:

    Closeup of Derek Jeter

    40. Hilary Swank at 20:

    Closeup of Hilary Swank

    Hilary Swank at 40:

    Closeup of Hilary Swank

    41. Mario Lopez at 20:

    Closeup of Mario Lopez

    Mario Lopez at 40:

    Closeup of Mario Lopez

    42. Tori Spelling at 20:

    Closeup of Tori Spelling

    Tori Spelling at 40:

    Tori Spelling with her husband and kids

    43. Brian Austin Green at 20:

    Brian Austin Green and Tiffani Thiessen

    Brian Austin Green at 40:

    Megan Fox and Brian Austin Green

    44. Demi Moore at 20:

    Timothy Hutton and Demi Moore

    Demi Moore at 40:

    Demi Moore and Ashton Kutcher

    45. And last but not least! Helen Mirren at 20:

    Closeup of Helen Mirren

    And Helen Mirren at 40:

    Closeup of Helen Mirren