Show off your love for math with this fun and quirky black t-shirt! The design features the square root of 144, followed by the phrase 'Years Old,' making it a clever way to tell everyone that you are 12. Made from a comfortable fabric, this tee is perfect for casual wear, math classes, or as a unique birthday gift for the mathematician in your life. Express your nerdy side and start conversations with this eye-catching and amusing garment!