Before deciding to delay social security beyond the normal retirement age, you should compare that outcome with drawing social security, investing the money, and not spending any of that money until the alternate retirement age that you are considering.
Even at a lower than expected 5% annual return, drawing social security and investing it (in a low-fee stock mutual fund) appears to outperform delaying social security payments, and for me it continues to outperform until about age 90 (plus your kids can inherit the money that is invested but not the money that the feds hold) - but do the numbers for your tax situation. Drawing Social Security two or three years early may be an even better choice (for me to about age 85, but again depending on tax rates).
It’s shocking and unexpected that leaving your money with the feds may not be the best investment!
And what if they start to means test people at some point it the near future?
Take it while you can.