We tell ourselves that age is just a number, but is it really? If you use these still-going-strong celebrity relationships as a yardstick -- measuring how age disparity affects the stability of a romance -- then yes: Evidence would suggest that age really is only a number.

We've assembled a collection of celebrity couples with age gaps of 10 years or more. Most of them have been together for a while, have started families and remain super happy, in addition to being insanely good-looking and talented.

Mind the gap? Nah, since they sure don't.

  • Mariah Carey and Nick Cannon - 10 Years

    There's a 10-year age difference between Mariah Carey (1970) and her hubby Nick Cannon (1980), but that isn't hampering their joy. They are parents to twins aka Dem Babies, who were born on their anniversary (April 30).

    Christopher Polk, Getty Images
  • Blake Lively and Ryan Reynolds - 11 Years

    The good-looking, talented, goldilocked duo of Blake Lively (1987) and Ryan Reynolds (1976) married somewhat quietly after bailing on high-profile relationships -- him with Scarlett Johansson and her with Leonardo DiCaprio.

    Alberto E. Rodriguez, Getty Images
  • Beyonce and Jay Z - 12 Years

    Beyonce (1981) began dating Jay Z (1969) in 2001 when she was 19 and he was 31. Over a decade later, the musical power couple are still going strong, with daughter Blue Ivy at home.

    Larry Busacca, Getty Images
  • Stephen Moyer and Anna Paquin - 13 Years

    Married duo Anna Paquin (1982) and Stephen Moyer (1969) hooked up while filming 'True Blood' in its first season. They married in Aug. 2010 and had fraternal twins -- a boy and a girl-- in 2012. The show will soon end but their relationship carries on.

    Kevin Winter, Getty Images
  • Megan Fox and Brian Austin Green - 13 Years

    The sultry Megan Fox (1986) and Brian Austin Green (1973) have been together since she arrived on the scene in Hollywood. They married in 2010, had a son and now have another baby on the way, further cementing their marriage and relationship despite 13 years of difference in age.

    Jason Merritt, Getty Images
  • Olivier Sarkozy and Mary-Kate Olsen - 17 Years

    Mary-Kate Olsen (1986) is one-half of those famous Olsen Twins and she is dating Olivier Sarkozy (1969), the half-brother of the ex-French president, and has been for almost two years. They've got a 17-year age gap, but that doesn't seem to affect this union.

    Larry Busacca, Getty Images
  • Jennifer Lopez and Casper Smart - 18 Years

    J. Lo's (1969) boy toy Casper Smart (1986) is one of her dancers. He is also a lot younger than she is but they exude heat. Plus, she's J. Lo and she is hotter than most women HIS age and younger. Fact.

    Michael Buckner, Getty Images
  • David Cross and Amber Tamblyn - 19 Years

    The 'Joan of Arcadia' actress Amber Tamblyn (1983) and the 'Arrested Development' comedian David Cross (1964) are happily married since 2012, despite nearly two decades of difference in their ages. They're quirky and cute.

    Ilya Savenok, Getty Images
  • Jason Statham and Rosie Huntington-Whiteley - 20 Years

    British model Rosie Huntington-Whiteley (1987) and British action star Jason Statham (1967) are separated by 20 years when it comes to their age. But the handsome pair keeps on keepin' on. They've been a unit since 2010.

    Fred Duval, Getty Images
  • Sam Taylor-Johnson and Aaron Taylor-Johnson - 24 Years

    Sam Taylor-Johnson (1967) is directing 'Fifty Shades of Grey' and she met her much-younger husband, 'Kick-Ass' star Aaron Taylor-Johnson (1990) on the set of a film. Despite the raised eyebrows over their romance and its nearly quarter-century of a difference in age, they have two daughters and took each other's names. That's lurve.

    Stuart C. Wilson, Getty Images
  • Rene Angelil and Celine Dion - 26 Years

    Celine Dion (1968) married Rene Angelil (1942) in 1994. He is her husband, manager and the father of her three children. Despite having a 26-year gap in their age, they have made it work for nearly 20 years. Amen to that.

    Andreas Rentz, Getty Images
  • Brahim Zaibat and Madonna - 30 years

    The Material Girl's (1958) BF is Brahim Zaibat (1988) and he is closer in age to her teenage daughter Lourdes than to her! But she's Madge. Call her a cougar. We call her hot.

    Dimitrios Kambouris, Getty Images