[nonelog]

"[...] extended the cellular lifespan of human skin and lung cells by more than 50%"

If we assume that the effect is the same for all types of cells, it follows that the life is extended by 50% (when keeping "all other factors" constant, as usual).

[dekhn]

That's not a safe assumption.

[nick__m]

It has to also down-regulate cells divisions, else it could be quite problematic.