Personalized 50 Is Just A Number Long Sleeve T-Shirt. Happy 50th birthday! 50 is just a number. A BIG number! Fifty years is a long time, you know. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL