青丝变白发执手到终老
[qīng sī biàn bái fā zhí shŏu dào zhōng lăo]
'Qing Si Bian Bai Fa Zhi Shou Dao Zhong Lao', meaning black hair becomes white, yet still hold each other’s hands until death do us part. Expressing a longing for undying love and eternal devotion.