Charisma Cardz challenge- How old?

Hi everyone! This week I made my first "commission" for my cousins 18th Birthday card from my grandparents. I was stumped for a while, boys cards are so hard, but then I looked through my stash and found the perfect thing! Can you tell what it is?

Its a star shaped weight from a helium balloon! My mam got a balloon for her 50th Birthday and I kept the weight after the balloon went down. I added stick on numbers and sewed the star onto my card.

Sorry for the shine on the photo. I would like to enter this card for the Charisma Cardz challenge- How old?  Bye for now =) x