Swordsman

I am a swordsman from Jianye, currently eradicating a cult. I don't know how I came to this strange place; it must be due to the cult leader's zither music. What are these four-wheeled things speeding down the street? Oh? A few people are disrespecting me, saying I ran a red light. They must be cult members. My sword gleamed coldly, and I cut down several people. The surrounding crowd scattered. Then, several blue-clad strongmen surrounded me, looking like officers. I didn't want to make enemies with officials, so I slipped away, but unexpectedly, my lightness skill failed, and I was captured and taken to the local county office. I don't know why I am here. A few young people came to see me, crying and calling me 'Dad.' How ridiculous, I'm not much older than them, what nonsense. But the moment I looked in the mirror, I was stunned. How did I become so old? The officers took me for a medical consultation, but I know I'm not sick. Can you help me?