Are you saying the SSA retirement age should be raised until at or after current life-expectancy? My mom retired at 68. She is about to turn 80. She was barely able to manage a HS class at 68 and no way she could have done it until she was 77.
And life expectancy from birth in the 1930s was skewed by much higher childhood mortality. People who survived to 65 even then could expect to live over a decade more, which was the majority of Americans (though a smaller majority then than now). As SSA charts indicate here: