Celebrate a 15th birthday with this unique and humorous black t-shirt! The design features a mathematical equation, '√225 Years Old', surrounded by various math formulas, making it a clever and geeky way to mark the special occasion. Made from a soft and comfortable fabric, this shirt is perfect for everyday wear. Ideal for math enthusiasts, students, or anyone who appreciates a good pun. This funny tee is guaranteed to bring a smile to anyone's face and makes a memorable birthday gift. Show off your love for numbers and celebrate turning 15 in style with this fun and quirky t-shirt.