"Retirement" means different things to different people. I was talking about financial independence, which means I can choose to retire, but more likely it will mean I find work I enjoy more, without considering the pay as much.
There are some risks, nothing is guaranteed: - I could have health problems that cost me too much even with health insurance - The market could crash and never recover
But if the market crashes and doesn't recover, maybe I'd have to go back to work for a while. Health problems are a risk for everyone, and no amount of money is going to guarantee good health. However, I bet that leaving the office job early will reduce the risk of health problems overall anyway.
If I meet someone, who knows. :)
But I am happy already, while I'm single and don't own a house. I also don't assume that it's necessary to own a house when one is married. The hypothetical We could decide whether it's worth trading 2-3 more years of work to buy a house. Maybe it would be, maybe not. The key is to consider the options, and not just assume you have to do what everyone else does.