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Living to 120 is becoming an imaginable prospect
(www.economist.com)
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this post was submitted on 01 Oct 2023
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Most of our financial advice for retirement has a hidden assumption that there is a large number of working age people helping not just social security, but also the stock market. A standard retirement portfolio will have a mix of t-bonds, stock market holdings, and a few other sectors.
We'd be looking at a scenario where there are a lot of small investors (a few million dollars is small on this scale), but proportionately fewer workers making use of that investment.
A US Millennial working today is going to need to be a 401k millionaire to retire with something comparable to their current standard of living. Most are going to fall short of that before we even talk about adding on extra life span.
The numbers I gave are entirely independent of social security. They presume a far below average stock market return. You're right they'll need to be a 401k millionaire, and per the numbers I gave, to achieve that will take around ~9k/year in pension investments if they intend to retire at 65. A lot obviously can not afford that, especially not early in their career, and will need to compensate accordingly later in their career to the extent they want.
But that wasn't really my point. My point is that the number of extra years - irrespective of your current pension situation - you need to work in order to maintain the same financial outlook is far lower than the number of additional years of retirement you can cover. Whether or not you're able to get to a sufficient pension level in the first place is a separate issue.
To how the stock market will fare, the big challenge there is whether or not automation will keep up or not, and frankly I think the biggest social upheaval over the next century will not be that it can't keep up, but that automation will outpace the proportional decline in the potential labour pool.
You might want to look at the Trinity Study of retirement portfolios. The general rate of withdrawal is lower than what you're quoting here. Closer to 4% or lower. Though this is giving way in some quarters to a sliding system, where you live it large in good return years, and frugaly in bad years.
But again, this all overlooks how that depends on a proportion of working people feeding stock market returns.
The general rate of withdrawal need to be lower if you have a portfolio that is very conservative. That may make sense when you're saving for you yourself and have a low risk tolerance, but it's not needed. That people feel worried enough to do that, though, is a good argument for insurance/state run pension schemes, because they an inherently pay out more since they can smooth out the risks and pay toward the maximum averaged returns.