At some point in the future, everyone who is currently alive, will be dead and the earth will be populated with people who do not exist yet.
Since I was born when my parent were in their late 30’s. And my father was as well, so my paternal grandfather was born in the 1890’s. When I was a kid he told me stories of his childhood. I was only 9 when he died, and at the time his stories were just that; stories. Now (I’m in my 50’s) I wish I had asked him things about those times. He was born and grew up in a world (mostly) without electricity, and without cars, phones, etc.
He was someone from a totally different world, and I knew him.
Added later: He was born “only” 129 years ago, everyone alive then, is now dead.