My reasons why I am maniacal obsessed (yes, I think about it many times a day, every day) about early retirement (more like financial independence than retirement), in order of importance:
1) Grew up dirt poor and I have a constant fear of ending up there again (suffered a lot as a child/teenager when I didn't even have $3 for discretionary expenses, I was incredibly envious of my peers who were better off).
2) (Forced) ageism in the industry: it's incredibly true, regardless of the few outliers who will post here on HN saying "not true, I'm 89 and still professionally coding my life away".
3) Constant stress due to learning: I absolutely love this field and programming is the thing I'm the most capable of doing, but the amount of study I have to do to keep up with what goes on actively eats into my personal life and free time, I have to dedicate many hours a week just to be aware of what is happening in my areas (e.g. frontend development, devops, ...). It's very stressful, to the point where if I could go back I would choose to pursue a more "stable" highly-paid field (e.g. medicine) and keep programming as a hobby.
4) Corporate politics in big companies: it's insane how much of your time will be spent on useless stuff just to drive your manager's personal agenda, think about it. I've being victim of spending months on useless refactory of some even more useless application in big co.
5) Employees treatment in startups: startups tend to have interesting work, but absolutely truly horrible financial incentives, horrible risk/reward and horrible mechanics around equity compensation (and I speak as someone who has been relatively lucky in this field, since the first startup I was in made me ~$100k in equity, and the other one about ~$1M in equity, still less than what I would have made in FAANG, for which I had very lucrative offers, but didn't accept for the bullshit of the previous point).
I'm 32 btw.