10. Michael Douglas and Catherine Zeta-Jones

 Catherine Zeta Jones and husband Michael Douglas at the AFI Life Achievement Award, A Tribute to Michael Douglas at Sony Studios in Culver City, Los Angeles, CA on June 11, 2009Joe Seer/Bigstock.com

Age Gap: 25 years

Both of them share the same birthday, only that they were born 25 years apart. They have been married for 13 years and have two children together Dylan and Carys. We wonder what the secret is of their successful marriage despite the wide age gap. Is it love, understanding or loyalty?

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