At Eighty, I Get a System That Wants Me to Enlist and Earn Merits?

After his soul transmigrated to another world, Zhao Yuan never managed to live a carefree life before he died. He thought that eighty years had passed in the blink of an eye, and that today he would finally bid farewell to the world. Just as he was ready to face death with a calm heart, who would have guessed that a System would show up? [The System has been charging for eighty years. It is now activated.] [Ding! Congratulations, Host. You have experienced a lifetime of birth, aging, sickness, and death, as well as life’s many flavors, and completed the beginner’s mission.] [Current rewards: Reforged constitution, aptitude +7, lifespan +1, comprehension +10.] [Do you remember the boast you made as a youth sixty years ago? “The east bank is down today, but in sixty years it’ll be my turn. Never bully an old man for being poor.”] [Eighty is the perfect age to strive for success. Host, get up at once and live it up one more time!] [Beginner’s mission issued. What matters most when making your way in the world? Your backing, of course. Find and join the strongest faction you can.] What a rotten System! I’m already eighty, and only now you show up with a comeback System? Zhao Yuan grumbled furiously. It wanted him to find powerful backing, but what could be stronger than the army? Watch as this eighty-year-old man grabs a saber and a gun, his white hair rousing the spirit of a youth once more, and charges boldly into the army!