Celebrate a milestone birthday with this humorous t-shirt! The black tee features a white graphic design that playfully states '√6400 YEARS OLD,' a witty way to say someone is turning 80. Perfect for anyone with a love of math and a sense of humor, this shirt is sure to bring laughter to birthday celebrations. Made from a comfortable fabric, this t-shirt is ideal for casual wear, birthday parties, or as a fun gift for friends and family. Its simple yet eye-catching design ensures it will be a conversation starter. Grab this unique shirt to make an 80th birthday unforgettable!