I worked with a developer who was 75 because he didn't know what else to do with his time. Sharp as a whip. He's still coding for a living and will turn 80 soon.
It really depends on what you mean by "plan" and how realistic your expectations are. And "most," I guess.
Check out the reddit sub FinancialIndependence if you want to discuss or learn.
If your income is high enough (tech workers are commonly several standard deviations above median income) and your cost of living / lifestyle expenses low enough (SFBA makes this harder, but may come with more income), it is definitely possible to retire in your 40s.
I didn't say that. I agree that most tech workers are not (realistically, anyway) planning to retire in their 40s. Most in their 20s probably do not have concrete retirement plans.
The claim I was responding to is andrewprock's statement:
> Most tech workers who plan to retire by their 40s will be working into their 50s.
Which makes a specific claim about the specific subset of tech workers who are planning to retire in their 40s.
Most tech workers who plan to retire by their 40s will be working into their 50s.