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Forgive me Ray, but I think your spreadsheet over complicates the question.

And aj, it doesn't matter whether you "spend" the money or not, as long as your withdrawal amounts from your financial assets don't change based on when you take social security.

I use the bathtub analogy to explain this for my wife. Forgive me for it's simplicity. There's an amount of water already in the tub (your financial assets), a faucet that adds water (social security, pensions), and an open drain (withdrawals). The only part of this analogy that doesn't work is the water in the tub "grows" (or shrinks) with investment returns. So think of social security as getting added to your pool of assets; don't think of it as a source for spending.

To calculate cross over points you need:
1) your benefit at 62
2) your benefit at 70
3) a real rate of return on your overall financial assets

I used a Motley Fool article on ss benefits that uses a Full Retirement Age benefit at $1500 per month at age 67 (results will differ slightly if your FRA is different). The benefit is reduced to $1050 at age 62, and increased to $1860 at age 70.

The cross over point for a 0% real rate of return is about age 79.
For a 2% real rate of return, age 82.
For 4%, age 86.
For 6%, age 93.

The decision on when to take social security is based on two things 1) when you die; and 2) your overall portfolio real rate of return. Unfortunately neither of things are knowable a priori.
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