As a child in the 50's my sister and I both had bangs (and my father did the trimming).
My mother went to a beauty school for a trim and color rinse when she was first getting grey hair. ( 1959 or so)
From what I recall at camps.....hair was long enough for pony tails or updo's but not always uncut.
Hair was worn down more often in the 50's and 60's. Perhaps the beehive of the 60's caused the directive.
I have umpteen photos that show shoulder length at church functions.
And a huge collection of ABI yearbooks from 50's & 60's.