I'm Already Eighty. Why Did the System Only Show Up Now?

Jiang Qingyu transmigrated to a high-martial world without a golden finger. Through hard work and talent, he diligently cultivated, enlisted in the army, and served his country, living a brilliant and glorious life. At eighty, just as he was nearing the end of his life... The “Stronger with Age” System successfully bonded with him. With every day he aged, his comprehension and natural aptitude increased by one point. From then on, Jiang Qingyu was reborn anew, living a second life. Humanity had gained a grandmaster, an unparalleled Martial God. “At eighty, I’m in my prime.”