If this really worked, why not transplant marrow so that the recipient can always have “young blood”?
Moreover, “new” blood cells are always “young”.
The whole thesis is a charade, imho
Does it matter whether it 'really' works or not ?
If you have billions of dollars and you are about to die, will you spend money on TRYING to live forever, even if it turns out it didn't work ?
Are there people who would (secretly) market and sell these 'cures' to those with money to waste ? The buyer who takes the 'cures' and still dies will not sue anyone. His/her family won't be suing the providers because that would expose them for participating in HIGHLY ILLEGAL PRACTICES. There is NOTHING to keep them from throwing away their money on a cure for 'death'.
Men in Africa rape virgins because they believe it keeps them from getting AIDS.
It doesn't, but have they stopped raping virgins ?
Perhaps the "magic" ingredients are in the plasma, rather than the blood cells?