Article continues below advertisementChristie Brinkley is proving age is just a number!On Thursday, January 15, the 71-year-old model shared a stunning Instagram selfie showing off her toned figure in a matching black bikini top and boyleg shorts. She smiled brightly in front of a mirror decorated with shells and sea finds she's collected over the years, turning them into a unique frame.Article continues below advertisementSource: @christiebrinkley/InstagramChristie Brinkley showed off her bikini body in Turks and Caicos.