This funny 40th birthday shirt reads "(square root symbol) 1600 Years Old" in a big bold style.
This funny 40th birthday shirt will make the perfect gift for someone special who’s turning 40 years old and loves math.
This thick cotton t-shirt makes for a go-to wardrobe staple! It’s comfortable, soft, and its tubular construction means it’s less fitted.
• 100% ring-spun cotton (Heather colors contain polyester)
• Fabric weight: 4.5 oz (153 g/m2)
• Shoulder-to-shoulder taping
• Double stitched sleeves and bottom hem