how stem cell tech make people live longer

[steelcat]

how stem cell tech make people live longer?

I think it is used to make new organs. not directly to make people live longer.

[biohazard]

At the moment, stem cell technology is not making people live longer, because there are no functional applications for it.

Stem cells are routinely used only in one context that I can think of: blood/bown marrow stem cell transplantation. In that procedure the patient's (e.g. a person who has had their own stem cells destroyed by chemotherapy or radiotherapy when treating cancer) own stem cells are replaced by HLA-matched cells from a donor, after which the stem cells establish themselves to the bone marrow of the patient and restart blood cell production. If you count saving someone's life as "making people live longer", then this counts. If you just want extra 20 years to everybody's life span, that's a whole different story.

In the future, stem cell technology may offer much more, like indeed producing new tissues or organs, but we are still pretty far from that, and recent development in the area of stem cells has not been nearly as promising as the hype surrounding the technology may suggest. But maybe the breakthrough is somewhere behind the corner...