首先还是问的时候的语气
用Are you
or Will you
or DO you
觉得合适吗?
应该是比较诚恳的语气,所以应该用“Would you”
英文：would you like accompanying with me to old until the end of our life?
中文：您愿意和我相伴到老,直到生命的尽头吗?