想你想到满头白发爱你爱到步履拖沓
[xiăng nĭ xiăng dào măn tóu bái fā ài nĭ ài dào bù lǚ tuō tà]
This means 'Missing you until my hair turns white; loving you until my footsteps become heavy.' Expressing intense, deep longing and love, it shows commitment even in old age or weariness.