What are you talking about? People have never lived longer than they do today. Even in 3rd world countries. And people died of all the things we imagine are modern, just that no one had described it yet. Go back 150 years, and if you died of something unknown, there just called it epilepsy and moved on. But it was probably lung cancer, or lead poisoning, or leukaemia or even just a small infected wound that no one noticed.
Go back 1000 years and Europeans didn't even name their children until they were about five because they were probably going to die anyway.
I feel the most massive thread drift coming on 😄