3424: [Part 1] Dealing with Uncertainty in Retirement Calculations by Darrow Kirkpatrick of Can I Retire Yet

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🗓️ 16 January 2026

⏱️ 13 minutes

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Summary

Discover all of the podcasts in our network, search for specific episodes, get the Optimal Living Daily workbook, and learn more at: OLDPodcast.com. Episode 3424: Darrow Kirkpatrick exposes how even modest shifts in retirement planning inputs, like inflation, returns, or lifespan, can produce drastically different financial outcomes. Using a simple couple’s case study, he reveals how uncertainty compounds to the point where the difference between financial freedom and running out of money can hinge on a few percentage points. Read along with the original article(s) here: https://www.caniretireyet.com/dealing-with-uncertainty-in-retirement-calculations/ Quotes to ponder: "Retirement planning can be like [the game of Telephone]. Seemingly small differences in input can compound into gigantic differences in output." "The longer you live, the more chance you’ll run out of money, so that’s a worst case for financial planning." Episode references: Social Security Administration Life Expectancy Info: https://www.ssa.gov/planners/lifeexpectancy.html Rational Expectations by William Bernstein: https://www.amazon.com/Rational-Expectations-Asset-Allocation-Prosperity/dp/0988780313 Learn more about your ad choices. Visit megaphone.fm/adchoices

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0:57.1	at Northwest Registered Agent.com slash ofd free. This is Optimal Finance Daily, dealing with
1:06.2	uncertainty in retirement calculations. Part one by Darrow Kirkpatrick of can I retire yet.com.
1:14.1	Remember the game of telephone? Players whisper a secret message down the line from one to the next.
1:21.0	When the message reaches the end of the line, it's repeated aloud to the group, and without fail, it's been mangled beyond recognition.
1:29.1	Retirement planning can be like that. Seemingly small differences in input can compound into
1:35.1	gigantic differences in output. It's a serious problem, both in retirement and planning for it.
1:41.3	In many cases, the range of input to your retirement equation creates an
1:46.2	uncertainty interval so wide that it makes predicting the future absurd. In this post, we look at a simple
1:53.8	scenario that demonstrates the problem. I'll show how much the uncertainty and key variables,
1:59.8	such as growth rate, inflation rate, and lifespan can impact your ending net worth.
2:05.8	Then, after reviewing what retirement models are and are not good for, we'll discuss solutions.
2:12.5	Understanding uncertainty in retirement calculations.
2:16.2	To better understand uncertainty in retirement calculations,
	...

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