At any age, the plan should be in never, ever, pay taxes again.
Otherwise, you are old, either overspending, or over saving. And, any income from stocks, housing, you name the scheme, may put you in a tax bracket that will cause your SS check to be taxed. Up to 85%. 
Is that 100% true? Then, Trump practiced it for life 
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No, not that “not paying taxes”
I meant avoiding any regular income that could be taxable. 
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