Dolly Parton celebrated her 74th birthday in January and she already has plans for her big 75th. Aging fine like wine, the icon has no intention of slowing down as she wishes to feature on the cover of Playboy magazine once again for her 75th birthday. On the show 60 Minutes Australia, Dolly Parton stated that she doesn't plan to retire anytime soon and thinks it's a great idea to have her on the cover of the Playboy magazine at the age of 75.