I was sitting in the community center sauna talking with a woman my age about Tiananmen Square, which we both have seen. A young guy listening to us asked us What is Tiananmen Square? We explained that was where the Chinese demonstrations were, standing in front of the tanks, the paper-mache Statue of Liberty, and all of that.
“Oh yes,” he replied. “That was before I was born.” He was right. Looking it up, the demonstrations were in 1989.