Interesting case in point is Argentina. The Falklands War happened in 1982, so well within some people's lifetimes. I learnt a few years ago that photographs and writings from Argentina from 1982 are already out of copyright. Photographs from the UK are not, and won't be until seventy years after the deaths of the people who took them. So total contrast between the two jurisdictions and reflected in publications about the conflict.

In the former Soviet Union, pre-1973 material is out of copyright. Again within living memory. I don't know what Russia etc have done with copyright since then.