Watty56 said:

...If you are 25 now, by the time you are 85 that $10K could have doubled 6 times and be worth $320K in today’s dollars!.


A math error, that should have been $640K
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epc replies:
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.

example: iif there were 2% annual inflation over 60 years
(1.02 ** 60) = 3.281030

$640K / 3.281030 = $195,060 in 2007 dollars.