Yeah these were mostly guys that are now in the mid/late 60s age bracket. Early post WW2 kids.
Times were tough for quite a few years after the war . My Japanese wife , now 61 ( I’m 60 ) , has told me stories about what the average person ate in those days . We had it SO good in America , but of course most Americans were happily unaware of just how tough it was here in Japan up until the early 60’s .