Personalized Act My Age T-Shirt. Give me one good reason to act my age! Just because you've grown old doesn't mean you have to grow up! Fun birthday gift! Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.