Hugh Hefner doesn't worry about his age because he lives by the motto "you're as young as the girl you feel".

The Playboy founder - who celebrated his 85th birthday on April 9 with a joint party in Las Vegas with his son Marston, who turned 21 on the same day - wasn't worried about reaching the milestone age because he is looking forward to his forthcoming wedding to 24-year-old Crystal Harris on June 18.

He said: "You're as young as the girl you feel, I'm a very lucky cat and I know it, age is just a number if you're healthy.

"All I'm looking for is a lot of love and Friendship. I think that is what life is all about: emotions and caring. My life is as good as it appears and better because it has included so much love."

Tweeting about his birthday, he wrote: "This Birthday Weekend was really one for the memory book. Too sweet. I had a really wonderful birthday in Vegas with Crystal, Anna, Marston, Claire Sinclair, Cooper, Samantha Crawley, Keith & his new girl (sic)."

Meanwhile, Hugh's fiancee Crystal has revealed she has tried to reach out to his ex-girlfriend Holly Madison after the 'Holly's World' star questioned whether she is the right man for the Playboy mogul.

Crystal said: "I think a lot of that was taken out of context and blown out of proportion. I have nothing against her. I've tried to be her friend. I asked her if she wanted to go to Disneyland and never heard back. No response."

Hugh added: "They have more in Common than either one of them know. Such as me! Ha ha!"