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Christie Brinkley is proving once again that age is just a number. The 67-year-old model and Billy Joel muse decided to share a bikini snap with fans over the weekend. I love her confidence. I don't think I even have a picture in a bikini (probably because I don't do the swimsuits) but I love that she is working it! Yes, she is showing off her taut abs but best of all she is flaunting supreme confidence which is the best looking trait of them all.