While it is true that queen size mattresses are the most sought-after choice, there are many reasons why a full size would be a better option. Firstly, many teens grow out of their twin-size pre-teen bed, but find a queen size too large. This is where a full-size mattress would be a good choice, lasting a teen a good 10 to 15 years, depending on the quality, long enough for when they reach adulthood and want something bigger to share with a partner. Other reasons why a double bed would be a better choice than a queen would be to fit into a larger dorm room, a first apartment, a guest room or a smaller bedroom for two people.