Personalized Age Taught Me Long Sleeve T-Shirt. If age has taught me one thing, it's that young people are stupid. Funny birthday gift or any time gift for your favorite old person! 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