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Sale Price $15.84.
Original Price $19.80 Comp. value
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21 Year Old Bday Geeky Math 21st birthday Gift T-Shirt
Qty:
Style
Basic Dark T-Shirt
-$1.15
+$8.20
Color & Print Process
Black
Vivid Printing: White Underbase
About T-Shirts
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About This Design
21 Year Old Bday Geeky Math 21st birthday Gift T-Shirt
Celebrate birthdays with a clever twist! This funny math design uses equations and square roots to reveal the age, making it the perfect choice for math lovers, teachers, students, and geeks who enjoy a good nerdy joke. Great for milestone birthdays, classroom celebrations, or anyone who appreciates clever humor mixed with numbers.
This witty math-inspired design turns age into a fun square root equation, bringing laughter and geeky charm to any party. Ideal for math teachers, STEM students, engineers, and puzzle fans, it’s a smart and funny way to celebrate birthdays with style. Perfect for cards, shirts, mugs, or party decorations.
Customer Reviews
4.7 out of 5 stars rating31.5K Total Reviews
31,480 Reviews
Reviews for similar products
5 out of 5 stars rating
By Jenny S.September 9, 2025 • Verified Purchase
Value T-Shirt, Black, Adult S
My 11 yo wore adult XL (5’7” 165#). The 8yo is small framed. She wore adult small and tied it in the back. Dark haired male wore adult large and 5’9”, 110# female wore adult medium . Good quality dark Heather gray, Gildan brand shirt. -it was next up from basic choice and cost about $20 per shirt. Not too thick or thin. Washed and dried well, no major shrinkage. Not see-through. Can wear a bra under it fine. Screen print is just as shown and well done, front and back.
5 out of 5 stars rating
By Jenny S.September 9, 2025 • Verified Purchase
Value T-Shirt, Black, Adult S
My 11 yo wore adult XL (5’7” 165#). The 8yo is small framed. She wore adult small and tied it in the back. Grandma wore adult large with long sleeve shirt underneath. Tall girl adult medium. Dark haired male adult large. Good quality dark Heather gray, Gildan brand shirt. -it was next up from basic choice and cost about $20 per shirt. Not too thick or thin. Washed and dried well, no major shrinkage. Not see-through. Can wear a bra under it fine. Screen print is just as shown and well done, front and back.
5 out of 5 stars rating
By Jenny S.September 9, 2025 • Verified Purchase
Value T-Shirt, Black, Adult S
My 11 yo wore adult XL (5’7” 165#). The 8yo is small framed. She wore adult small and tied it in the back. Dark haired male wearing adult large and female wearing adult medium. Good quality dark Heather gray, Gildan brand shirt. -it was next up from basic choice and cost about $20 per shirt. Not too thick or thin. Washed and dried well, no major shrinkage. Not see-through. Can wear a bra under it fine. Screen print is just as shown and well done, front and back. They printed random cupcake image I downloaded from internet with no problems! Looked perfect! Front design was stock from zazzel.
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Other Info
Product ID: 235798625897268239
Created on: 9/10/2021, 10:17 PM
Rating: G
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