Article continues below advertisementJulianne Moore is proving that age is nothing but a number!The Sirens actress, 64, shared a rare bikini selfie via Instagram on Tuesday, August 12. Makeup-free with a sun-kissed glow, Moore posed confidently in a sleek black string two-piece bikini.The carousel of photos documented the first few days of the month, including a Wordle 12-day streak, a colorful healthy meal and the birthday of her dog, Hope.Article continues below advertisementJulianne Moore Posed in a Black BikiniSource: MEGAJulianne Moore looked stunning in a black bikini.