On of the key's to SS is FRA, or Full Retirement Age. In Miss Kitty and my case that was 66. So when SHE turned 66 (she's 6 months younger than I... Yes I robbed the cradle) is when we had all this happen. If she delays filing for her SS until she's 70, then we've collect 4 years of spousal benefit. Taxable, of course, but found money none-the-less.
And the reason, students, you wait, is that for every year you delay filling for SS after FRA is your benefit increases 8% up until age 70. That's like real money, given the current low rate of inflation. THE BIG NEGATIVE, is you might DIE before you can enjoy it.
Place your bet. Take your chances.