Paper I can dig up:
http://www.cell.com/cell/fulltext/S0092-8674(16)31664-6
So far as I can tell, there's no actual trials been done, only model tests, though I've not read it thoroughly, nor am I a trained biologist.
Augh god DAMN IT I had high hopes here. They induced, albeit transiently, the
fucking Yamanaka factors. That doesn't sound like an aging therapy, that sounds like die of teratoma all day erryday.
Those four factors are the holy tetrad of reprogramming normal cells into induced pluripotent stem cells. Which are great for therapy, but need to be cultured into target cells or they basically try to form a new embryo inside your body like one of the lesser known Xenomorph species.
Now, they claim they didn't get Nanog protein expression, which is the pluripotency effector, but the risk is there.
This is a mice model of premature aging, progeric mice. They have a fucked up cell nucleus component which results in symptoms similar to aging (same thing happens in humans with this defect, for reference). They claim there's similar changes in 'normal' aging, and there are good reasons not to doubt that, though it's still a
model, might not be 100% accurate to physiological aging.
Optimistically, if the transient expression does help and NOT KILL YOU HORRIBLY, that's pretty great. Putting in something with permanent expression would be harder, and the expression of the factors
could be possible to induce pharmacologically, short-term. Then it's only a matter of dying in one of 'em massive wars rather than old age down the line.