What Should I Do Now That My Junior Brother Has Turned into an Old Geezer?

I have a junior brother. He left the mountain at fifteen and never came back, not even after a hundred and eighty years. Cultivators may live long lives, but I thought I'd never see him again. I never expected him to return recently. And... to have turned into a decrepit old man. Junior Brother's version: I've been in love with my senior brother for ages. Knowing he could never return my feelings, I left the mountain. Only now, when I'm old and near death, did I decide to see him one last time. I never imagined that, to help me, he'd not only obtain the world's most precious treasure, the South Sea Pearl, but also capture a dragon. So... my senior brother is a big shot? A youthful-faced, ruthless, ten-thousand-year-old monster of a senior brother, top x a junior brother who may look old, but is still younger than his senior brother no matter what, bottom Theme: Calling for sincere emotions and exploring the meaning of life.