你曾为谁红绳结发你今为谁白发苍苍
[nĭ céng wéi shéi hóng shéng jié fā nĭ jīn wéi shéi bái fā cāng cāng]
In ancient China tying one’s hair together with red string signifies engagement. It questions for whom they once pledged their life (marriage) and who made them old with white hair now. In context, it may be referring to the changes brought by life experiences and relationships - from first loves to aging and loss.