Celebrate a milestone with this clever and comfortable black t-shirt. The bold, yellow graphic features a square root symbol over the number 3600, with the words "YEARS OLD" underneath, making it a fun way to announce someone is turning sixty. This casual tee is perfect for birthday parties, casual outings, or just lounging around. The classic fit and soft fabric ensure all-day comfort. A unique and memorable birthday gift for the math enthusiast in your life, or anyone with a good sense of humor.