This could really offend someone at any age. A birthday card with versatility. 
 
Card Details
A2 size (4.25" × 5.5")
Premium 110 lb cardstock
Blank inside
White Euro-flap envelope included
Packaged in a protective clear sleeve
Designed and printed in Philadelphia

Front Reads: 
“you always just seemed forty to me. i'm kidding. happy birthday.”