Celebrate a 11th birthday or anniversary with this fun and quirky t-shirt! The design features a bold graphic of the square root of 121, cleverly stating "Years Old". The black t-shirt offers a classic and casual look, perfect for everyday wear. Made from comfortable fabric, this shirt is sure to bring smiles and start conversations. Makes a unique and memorable gift for the math lover or anyone with a great sense of humor! Wear it to birthday parties, family gatherings, or just around town to show off your fun personality.