I'm Eighty Years Old, You Want Me to Become a Wife and Become an Immortal?

Ning Chuan traveled through the world of immortal cultivators. When he awakened his spiritual roots at the age of eighty, he was sent to an evil cultivator family to be his son-in-law. It is about to be reduced to a cauldron and be harvested and squeezed dry. Fortunately, he awakened a "descendants system". Each additional offspring will be rewarded. "Have your first heir and get a 'Pure Yang Kidney Body'." "With a second heir, you will get the entry 'Old and Strong'. For every ten years your age increases, your physical attributes will increase by 0.1%." "Have a third heir and gain ten years of cultivation." … It was not until many years later that Ningchuan, who had hundreds of millions of descendants, became the ancestor of the imperial clan!