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But in order to have more money up until age 90.8, you can't spend the money that you are getting from SS beginning at age 62 - you have to actually invest it.

You didn't look at the spreadsheet, did you? I think it is all explained there, although maybe not comprehensively -- it's been several years since I last touched it.

The idea is to compare like to like. So, yes, you have to invest that money instead of spending it.

Let's compare the 2 cases.

Case A is defer to 70, then get the (increased) SS. Call this amount $SS70. By definition, your living expenses between 62 and 70 come from somewhere. That somewhere drops out of the picture at 70.

Case B is take the (reduced) SS at 62 and invest it. Call this amount $SS62. Your living expenses between 62 and 70 come from the same somewhere that it came from in Case A. Likewise, it drops out of the picture at 70.

SS62 is less that SS70.

Now, in Case B, you have a chunk of money that is from investing the $SS62 from 62 to 70.

At 70, the magic well that you tapped to live on from 62 to 70 drops out.
You then want to collect the $SS70 amount every month.

For Case A, the entire $SS70 comes from the SSA.

For Case B, you get $SS62 from the SSA, and the shortfall ($SS70 - $SS62) is taken from the investment account.

In each case, you get $SS70 per month.

The question is: How long does this investment account last before it is depleted? That's the crossover point. The higher the earnings are, the longer the account will last. At a high enough return, that account will NEVER be depleted.
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