Funny 12th Birthday T-Shirt - Square Root of 144
Celebrate a 12th birthday with this unique and humorous t-shirt! The design features a bold square root symbol with the number 144, followed by the words "years old," making it a clever math joke for anyone turning twelve. Made from a soft, breathable black fabric, this tee offers comfort and style. The understated graphic makes it easy to match with any outfit. It's a standout piece for casual wear or special birthday occasions. Ideal as a birthday gift that's both fun and functional.
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Size Guide
Our tees fit true-to-size. Check the size chart before ordering to ensure a perfect fit.
Shipping Time
Processing 2–3 business days; standard delivery 5–12 business days depending on destination.
Care Instructions
Machine wash cold with like colors. Do not bleach. Tumble dry low. Iron inside-out if needed.