思君令人老我已千百岁
[sī jūn lìng rén lăo wŏ yĭ qiān băi suì]
'Si jun ling ren lao wo yi qian bai sui' translates to 'Thinking of you makes me old; I am already hundreds of years old', expressing deep, prolonged love and longing for someone that feels like it has aged the speaker beyond measure with its intensity.