Earlier quoted context omitted.
When you're talking about being retired for fifty years, it's the average that matters.
"When you're talking about being retired for fifty years" Yeah. We aren't. This whole thread spawned because the claim was that you can retire in 10 years if you save 66% of your income.
I don't understand. Retiring after 10 years means you'll be retired for around 50 years, doesn't it?