Find 18th birthday wrapping paper to match different recipient styles and party themes. Presents wrapped with unique paper makes the giving and unwrapping of gifts more fun! In the United States, persons are legally considered to adults at the age of 18, and they are allowed to both vote and join military service. Across the world, the age of 18 is the most common age of majority. No matter where you live, celebrating an 18th birthday is a big deal, worthy of special wrapping paper!