I'm 62, and it's had the opposite effect on me. I've never stopped loving writing code, learning new things, trying random stuff, etc. I code all day, and spend more time playing with stuff in the evenings (the main difference is I'm sipping some scotch while I do it). Having to use LLM's at work has sucked most of the joy out of my work. Fighting with them, keeping them on track, catching hallucinations before they go too far, wasted effort...it's exhausting me like nothing else in my 40+ year career.