Are reasearchers working on a pill that can stimulate a "fountain of youth" effect for humans?
Is it already available?
Could it possibly extend human existence an extra 20 or 30 years?
Nothing imminent is on the horizon. There are principles mortal tested in the elemental sciences which might contribute to longevity, but the research is immature.
It will probably come available, though the awaking of the cell survival genes will own it's price to pay.