I’m old enough to remember when V-E Day and V-J Day were identified on calendars. Today, I wonder how many people would know the answer if you asked them: What is V-E Day?”
Not to put too fine a point on it, but do you celebrate Waterloo day?
WWII was 78 years ago - most who experienced it are dead. It has entered faded history like the Napoleonic wars.
We should remember it, yes, but we can’t expect everyone to remember them, no more than we expect people to remember the 7 years war or the war of Spanish succession etc.