Mike / Splash News 1 / 6
Mike / Splash News 1 / 6

Simon Cowell is wary of having children with his fiancee Mezhgan Hussainy because he worries he might be too old to play with them.

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The "American Idol" judge proposed to the make-up artist earlier this year, and the couple is currently planning their wedding.

But Cowell, 50, admits that the thought of becoming a father troubles him because of his age.

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In a candid chat with Oprah Winfrey, he admits, "I worry about that (having children) because of my age. When I was younger, my dad used to play soccer and games with me and I worry ... that if I was 70 ... "

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The full interview is set to air on May 20.