When did I become invincible?

Deep in Mud Flat Alley. Inside a neatly cleaned large courtyard. A handsome young man lay sleeping in a chair. Ding! At this moment, an electronic sound rang in his ears. Chen Ping'an stretched lazily and opened his sleepy eyes. The peach tree bathed in the bright courtyard came into view. "Five years have passed in the blink of an eye, and you've kept me company the longest." This peach tree was the one he planted himself when he came to this world.