"When We Were Young" by Hollow Coves is a song about nostalgia and longing for the carefree days of childhood. The lyrics describe the adventures and simple pleasures of youth such as climbing trees, chasing birds, and building sandcastles. The chorus expresses the singers' desire to relive those memories and emotions, wishing they were young again. As the song progresses, the lyrics acknowledge the passing of time and the realization that dreams and goals may have been lost along the way. However, there is still hope for new experiences and adventures in the future. Overall, "When We Were Young" is a reflective and bittersweet song that celebrates the joys of youth while acknowledging the inevitable changes that come with age.