A week ago my oldest child turned 14 and this is the card I put together for him. It uses the Number of Years and the Large Numbers framelits along with the new Layering Squares framelits.
I added some Holiday Fancy Foil vellum over the top of Basic Black card stock and then added my layers of squares. I like the scalloped edge as an option for the layers.
I added a little pocket for a gift card on the inside and used the BYOP stamp set to add a few phrases as well.
BYOP, Number of Years
Whisper White, Basic Black, Night of Navy card stock
Holiday Fancy Foil Vellum
Layering Squares framelits, Large Number framelits