牵着你手变成老婆婆牵着的手变成老公公
[qiān zhe nĭ shŏu biàn chéng lăo pó pó qiān zhe de shŏu biàn chéng lăo gōng gōng]
The phrase translates to growing old together while still holding each other’s hands like newlyweds. This reflects a desire for love to last eternally even after growing old with one's beloved partner.