But Hollywood star Demi Moore says she doesn't understand how she's become a poster girl for cross-generational relationships.

The 46-year-old star, who is married to actor Ashton Kutcher who is 15 years younger to her told W magazine, "I'm certainly not the first person to be in a relationship with a younger man, but somehow I was plucked out as a bit of a poster."

"I don't know why that is. But I just kind of step back sometimes and say 'There is some reason, and what is it that I have to share in a positive way?'," Moore added.

Moore's marriage to Kutcher has been reportedly instrumental in causing a surge in women looking to date a younger man.

In 2005, just 8 per cent of single women in their 40s and 50s said they would date a man five or more years their junior. Today, more than a third said they would consider a younger man, according to online dating service Parship.

Despite the age gap, mother-of-three Moore said she and Kutcher 31, are still very much in love.