The song "Casey" by Jupiter Sunrise is about a close friendship with someone named Casey. The narrator reflects on a time when Casey was there for them, catching their sleeve when they needed someone to rely on. They also remember a moment when Casey helped them feel confident and fearless. As the song progresses, the narrator acknowledges that they have grown older and long for their lost innocence. However, they also admit that Casey is too young for them, implying that their relationship could potentially be taboo or inappropriate. Overall, "Casey" explores the complexities of a close friendship that blurs the line between platonic and romantic love. The lyrics suggest a yearning for the safety and comfort of youth, but also a recognition that growth and change are an inevitable part of life.