Personalized Old As Dirt T-Shirt. Old as dirt, and just as lively. When you're way over the hill and you were on a first name basis with fossils, this is for you! Funny birthday gift for your favorite senior citizen! 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.