Sadly it seems like all the researchers are still at the early hypothesis / vaguely-grounded speculation stage.
Of course, everything has to start somewhere, and the true hypothesis is built on the bones of the false ones, but it also means that it's hard for these efforts to gain the scale of funding that could really accelerate them.
When somebody manages to substantially slow aging in an animal (preferably a mouse, but maybe a fruitfly would be enough), I think the faucet will really turn on.
Quick Google search shows plenty of results, including several papers in Scholar
The first in Scholar is http://onlinelibrary.wiley.com/doi/10.1111/j.1474-9726.2012.00832.x/full, which quotes several other ones in the beginning that found increases in mice lifespan.
Are you unaware of these, or are they "not substantial" enough for you? If the latter, how much would mice lifespan have to be increased for it to count in your book?
Saw this on HN.
Live forever: Scientists say they’ll soon extend life ‘well beyond 120’