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...You also made a logic error in that in 2067 those $640 will be
in 2067 dollars.

To put that into today's dollars you'd have to deflate that number
by 60 years worth of inflation/deflation....

My assumption was that the historical average return was around 10.5% and after inflation you might conveniently clear 7.2% after adjusting for inflation. By the “rule of 72” it would double in around ten years.

so the values at different ages would be;

10K at 25
20K at 35
40k at 45
80K at 55
160K at 65
320K at 75
640K at 85

Admittedly this is VERY rough but it already takes inflation into account.

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