I thought the wording (I won't tell if you won't) was pretty apt for these birthdays & it gave me the idea of hiding something - so I came up with this:
The front flap lifts up to reveal the age! To create the blank background, I simply masked the area with a cut-down post-it note when I rollered the rest of the card. I stamped inside the card using the Happy Everything Stampin' Up! stamp set:
I made the 2 cards at the same time, which really speeded things up & the only difference was the age stamped under the flap.
If you're interested in joining the craft club, or finding out more about it, you can follow this link.