Not sure if the title's clear. But what I mean is that people seem to telescope time. So all older people are regarded as having the attitudes and beliefs and tastes were current in the 40s and 50s -even though somebody 70 today was born in 1945, was a young person in the 60s!
There's a thred currently about a grandmother leaving a baby to cry and people are saying things like "Oh, that generation believed it was good for their lungs". It turns out that the grandmother concerned is younger than I am (!) and when my dd was born it was all slings and attachment parenting and co sleeping........
I first to think about it when my ds's choir went to entertain people at Retirement home, and they learned songs from the First World War to sing to people who were probably mostly not even born in 1918!
It's as if history is in chunks, rather than linear.........older people come from the chunk between 1920 and 1940.........