昔日旧城少年已失
        
            [xī rì jiù chéng shăo nián yĭ shī]
        
        
            'Lost Boy from the Old City Past' indicates the change in a young person's life and mentality over time. This reflects the feeling that someone has matured and cannot go back to their former simple days in an older town. It suggests a bittersweet realization about youth.