Personalized Underestimate Old Man Golf Cart Youth T-Shirt. Funny retired golfer Youth T-Shirt - Vintage Black with golf cart and golfer. Never Underestimate An Old Man With A Golf Cart. 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.