Are there any experts in life-span extension? Or, maybe what you meant was longevity extension - are there any experts in longevity extension? (Life-span extension means avoiding early death, longevity means being able to live longer than any humans have ever lived, say, 200 years or whatever.)

I’ve read a bunch of pseudo-science and heard about so-called “experts” claiming it’s possible and coming, but the field seems to attract charlatans promising immortality…