My two girls shared a double , starting at ages 2 and 4 . My younger sister and I ended up together all the time and we loved it !!!! So as soon as my youngest was out of the crib I was so excited to start the tradition with my girls !! They shared a room and bed until they were 21 and 17 ( by choice ) they never went through the I hate my sibling phase ! Now that I have a 5 yr old as well , I will find her curled up to her big sis !!!!