The point being, you have to work long enough you can afford to do stuff, but you have to retire early enough you're able to do it.
I heard that but the bills have to be paid, too. It's very helpful to work at a place that has a pension, and even more helpful if that pension is geared to your years of service rather than your age. In my case, we've been lucky enough to have pensions (only 30% of American workers do, down from 71% in the 1970s) but ours are geared to age and not years of service.
I have a number in mind for the portfolio and when it hits that, I will be able to be sure I don't outlive my money. Then I will retire. I even have a projected timeframe, if it works out.
The hardest part about the "you can always get a job" advice is that it is not true for people over 50. It is much harder to gain employment as a new employee as you age. As you age, you rely more on fixed "past money" and take on greater risk financially that has to be managed, and especially if your retirement is based on a defined contribution plan (like a 401k) rather than a defined benefit plan (like a pension). If you have a pension based on a certain amount per year of seniority rather than a lifetime annuity, you have to take that into consideration, as well.
The older you get, the more health risk you run, too, for a costly problem or for extended care. That's why it's also an easier choice to retire early if your employer provides you with insurance that can bridge to Medicare and even nicer if it supplements once you get to Medicare.
My prior employer had that but rescinded it during the Great Recession, so in my case, I have no such insurance and would have to buy it if retiring younger than 65. The earliest I can access my pension from the former employer (at a reduced monthly payment) is age 62. The earliest I could vest in the pension where I work now, following loss of my old job during the crash, is after 10 years service, which for me would be age 65. I do not plan to work until age 65, so I won't get that pension.
So retirement security depends highly on individual circumstances. Some of the better professions for retirement are higher risk: policeman, fireman, soldier. Or they are high on the corporate ladder: vice president, president, CEO, CFO. For all the folks outside of those, when to retire is highly circumstantial.
I'm just saying all this because I know people who have retired early and had a fantastic experience, usually because they are planners and they have planned out their expenses and income. Then I know folks who retired early because the stock market was high at that time or because of some other financial windfall, and their experiences have not been nearly so grand. It sucks to outlive your money.
So it really is true: Failing to plan is planning to fail. Here's hoping we all can retire when we want to rather than when we have to.