从青丝至白发从黄髫至已暮
[cóng qīng sī zhì bái fā cóng huáng tiáo zhì yĭ mù]
This expresses the entire course of one's life or a specific experience - from young to old age, from the youthful years until reaching the final moments or stages. 'From black hair to white hair' refers to the appearance change from youth to old age. The user may intend to convey a deep experience or long-lasting journey filled with various emotions like reminiscence, contemplation, gratitude, longing for someone special, or changes between past and present.