Personalized 40 Super Birthday Youth T-Shirt. You're 40! Able to leap over the hill in a single bound! You may not feel like a superhero at forty, but you can look like one. Funny birthday gift for the super hero in your life. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.