Old people commit suicide faced with "the bleak years of decline." It's distressing, but not incomprehensible. When teenagers--who should have their best years ahead of them--kill themselves, however, it is both saddening and inexplicable.
「晚景淒涼」的老人自殺，叫人痛心，卻不難理解；但「前途似錦」的青少年自殺，除了令人惋惜外，更令人感到不解。