I'm Often Mistaken for an Adult Because of My Age Shirt | Funny Birthday Tee

Technically an adult. Spiritually? Debatable. This hilarious "I'm Often Mistaken for an Adult Because of My Age" tee is the perfect birthday shirt for anyone who refuses to fully grow up — and is proud of it. Bold, funny, and 100% relatable.

• Soft, comfortable unisex tee — relaxed fit, true to size
• Perfect birthday shirt for milestone birthdays — 30th, 40th, 50th, 60th & beyond
• Great funny gift for anyone with a great sense of humor
• Perfect for birthday parties, birthday dinners & everyday wear

Age is just a number — maturity is optional! 🎂😂

👕 Fabric & Style Options

Gildan Softstyle & Bella Canvas (Adult Unisex Tee)

• 100% preshrunk ring-spun cotton jersey
• Lightweight, breathable fabric (4.5 oz/yd²)
• Sport Grey & Antique: 90% cotton / 10% polyester
• Heather colors: 65% polyester / 35% cotton

Comfort Colors®

• 100% ring-spun U.S. cotton
• Medium-weight, garment-dyed fabric (6.1 oz/yd²)
• Thicker feel with a vintage, lived-in look
• Pre-shrunk

Youth & Toddler Tees (Gildan Softstyle & Bella Canvas)

• 100% preshrunk ring-spun cotton jersey
• Lightweight fabric (4.5 oz/yd²) — fabric blends may vary by color

Adult Unisex Sweatshirt (Gildan Heavy Blend)

• 50% cotton / 50% polyester
• Medium-heavy fabric — cozy and comfortable
• Loose fit, runs true to size

📏 Size & Fit

• Available in adult, youth, toddler, and baby onesie sizes
• Unisex fit — relaxed and comfortable for all body types
• Size chart included in listing images — please review before ordering

🎨 Print & Color Note

Colors may vary slightly from screen to screen due to monitor settings and lighting. Minor variations are normal — your print will be vibrant, sharp, and built to last.

📦 Production & Shipping

• Made to order: Production takes 3–5 business days (Mon–Fri)
• Shipping: USPS First Class (3–5 business days, estimated) — Priority upgrade available at checkout
• Delivery dates are estimates, not guarantees — order early to ensure arrival before the party!

❌ Returns & Exchanges

Because every item is made just for you, we're unable to accept returns or exchanges. Please double-check your sizes and customization details before placing your order.

🧼 Care Instructions

• Machine wash cold or warm — wash inside out
• Non-chlorine bleach only
• Tumble dry low or lay flat to dry
• Do not iron directly on the print
• Do not dry clean