@MIKA456
Don't confuse SURVIVORS BENEFITS with SPOUSAL BENEFITS.
The SS Rule of Deemed Filing is what you are talking about above but that is only applicable with SPOUSAL Benefits NOT SURVIVORS Benefits. Completely DIFFERENT Benefits with different rules, benefit structures and eligibility.
The SS link that I gave you in the previous answer says this:
Widows or widowers benefits based on age can start any time between age 60 and full retirement age as a survivor. If the benefits start at an earlier age, they are reduced a fraction of a percent for each month before full retirement age.
If a person receives widow's or widower's benefits, and will qualify for a retirement benefit that's more than their survivors benefit, they can switch to their own retirement benefit as early as age 62 or as late as age 70.