一生一世一双人白头偕老共此生
[yī shēng yī shì yī shuāng rén bái tóu xié lăo gòng cĭ shēng]
This beautiful phrase describes the ideal picture of a marriage where two people live together happily all their lives until old age, which stands for the traditional Chinese marriage vow of eternal love and loyalty. This term can be loosely translated as 'to grow old gracefully with the one you are devoted to for all your life.'