Funny Level 13 Unlocked Official Teenager. Funny gift idea for boys who turn 13 and are therefore officially teenagers. Great gift idea for the 13th birthday for gaming lover and gamers. -- Choose from our vast selection of stickers to match with your favorite design to make the perfect customized sticker/decal. Perfect to put on water bottles, laptops, hard hats, and car windows. Everything from favorite TV show stickers to funny stickers. For men, women, boys, and girls.