Personalized Color Block 16 Youth Long Sleeve T-Shirt. Color block 16th birthday Youth Long Sleeve T-Shirt - White with pink and lavender color blocks, birthday cake, balloons and the numbers 1 and 6. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)