陪你长大也不能陪你老
[péi nĭ zhăng dà yĕ bù néng péi nĭ lăo]
'陪你长大也不能陪你老' means 'Grow up with you but cannot grow old with you'. It speaks to the bittersweet experience of being an important figure in someone's formative years but acknowledging an eventual departure or end to that relationship, conveying transience and emotional depth.