They did quite well, but I shudder at what they could have accomplished by even just moving 10% of their CD money to equities in the '50's to today.
And they are not alone. I am old enough to remember that 70-80% of those born at that time were ghastly afraid of the market, due to what happened in '29 and afterwards.
My parents (both born in 1914) were like that. CD’s only, and never all in the same bank.