The tv show Happy Days was really a documentary! Yes, those days after WWII and before the boomers changed everything in 1965 (the first year that postwar babies graduated from high school) were magical years! No worries about no go areas in cities; no worries about playing outdoors; parents did not have to supervise ‘playdates’ etc etc...
I never thought of Happy Days in those terms but you’re spot on. That’s the time frame.