We've pretty much already done this with rats. The pop-sci summaries of the research I've seen (with all the caveats implied) say this improves cognition and memory, as well as general physical health and (because rats) fur colouration and quality.
Sadly, the usual problem is that rats aren't really very close to humans, merely closer than the other stuff we research with.
Yeah, fair enough. The goal isn't necessarily magic. But I feel like the way to get there, at the moment, mostly is, especially with something like comparing a mouses lifespan against ours.
Sadly, the usual problem is that rats aren't really very close to humans, merely closer than the other stuff we research with.