Personalized Rockin' For 40 Years Anniversary Youth Long Sleeve T-Shirt. Two happy rocks under a banner that reads Rockin' for 40 years is a humorous anniversary gift design to tickle the funny bone of friends and family celebrating 40 yeqars together. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)