What doctors know would fill a shotglass, compared to what they don’t know, which would fill a bucket. The real problem though, is that they don’t know, how much they don’t know. Then there are always those know it all type doctors. A lot of what they know, just ain’t true. I know all this, from experience.
It apparently is related to hormone variations.
Certainly doctors don’t know everything.
But I would be willing to bet that they have learned as much if not more about biochemistry and molecular biology in the last ten years than the entire previous history of medicine combined.
Meanwhile, medical advances cause the average American life expectancy blows past 80 without slowing down. ;)