Some people don’t have much of a choice. So I advise them to wait and get the higher base check, on which future cost of living adjustments will apply.
And I question your math. Get back to me in 10 years and let’s see if your investment portfolio of SS checks does better overall than waiting til age 70, and collecting the extra inflation adjustments.
And even then it won’t be the answer. Write me the day before you die, and see how your investment porfolio did by then — and whether you were better off with the ever-increasing SS checks or the results of your portfolio.
That’s the bet you’re making!