Personalized Blooming 40th Birthday Youth T-Shirt. 40th birthday Youth T-Shirt - Heather with whimsical number 40 covered with flowers and leaves says 40 AND STILL BLOOMING! Perfect for over the hill florists and gardeners. 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.