Restricted Application
If an individual was born on or before January 1, 1954, is currently married, or divorced and eligible for a benefit on an ex-spouse's record, once they reach age 66 (full retirement age) they may benefit from a restricted Social Security application strategy. Assuming they have NOT yet claimed their benefits.
In the case of married couples, the optimal strategy is to have the lower-earning spouse file for their own benefits first, and then the higher-earning spouse subsequently files a 'restricted application' at full retirement age for their spousal benefit only and delays filing for their personal benefit until age 70.