I have somewhat of an answer for this, although perhaps not quite the one you are imagining, as this is related to donations rather than to work/career. I take inspiration from patient philanthropy, and would donate from investments in old age. But in brief, my idea would be something like that: invest to both A) support yourself and B) to give.
Imagine two scenarios. In scenario A, you work from age 30 to age 65, donating 10% of your salary every year. In scenario B, you you work from age 30 to age 65, investing 10% of your salary every year, and starting at age 66 you donate 10% of your investment returns until you die at age 80. In this example the total amount of donations from Scenario A is $363,961, and the total amount from Scenario B is $407,072.[1]
I predict that eventually my body and mind will be weak enough that I am not able to do work, but my money can still go to work to earn more money.
There are lots of simplifying assumption here: starting salary is $70,000, inflation is ignored, investment returns have no sequence of return risk, I’m not accounting for all your money that is left over after you die, I’m not accounting for the chance of expensive medical care in old age, I’m not accounting for unexpected expenses during any part of life, salary increases are steady each year, etc.
This also doesn’t account for net present value of the money, nor for discounting regarding time value of lives saved, so this should be viewed as a simple/sloppy/preliminary analysis rather than as a strong argument.
I have somewhat of an answer for this, although perhaps not quite the one you are imagining, as this is related to donations rather than to work/career. I take inspiration from patient philanthropy, and would donate from investments in old age. But in brief, my idea would be something like that: invest to both A) support yourself and B) to give.
Imagine two scenarios. In scenario A, you work from age 30 to age 65, donating 10% of your salary every year. In scenario B, you you work from age 30 to age 65, investing 10% of your salary every year, and starting at age 66 you donate 10% of your investment returns until you die at age 80. In this example the total amount of donations from Scenario A is $363,961, and the total amount from Scenario B is $407,072.[1]
I predict that eventually my body and mind will be weak enough that I am not able to do work, but my money can still go to work to earn more money.
There are lots of simplifying assumption here: starting salary is $70,000, inflation is ignored, investment returns have no sequence of return risk, I’m not accounting for all your money that is left over after you die, I’m not accounting for the chance of expensive medical care in old age, I’m not accounting for unexpected expenses during any part of life, salary increases are steady each year, etc.
This also doesn’t account for net present value of the money, nor for discounting regarding time value of lives saved, so this should be viewed as a simple/sloppy/preliminary analysis rather than as a strong argument.