In his song 'Young Boy,' Paul McCartney explores themes of youth, innocence, and the passage of time. The song reflects on the experiences and emotions of a young person navigating life's challenges and joys. It conveys a sense of nostalgia and the universal journey from childhood to adulthood, capturing moments of discovery, growth, and self-realization. Particularly poignant moments in the song include reflections on the guidance and support received from others and the importance of holding onto youthful dreams and aspirations.