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?
I'm moderately familiar with the work that exists. No need to google it for me.
I'm talking about something on the order of winning the Methusaleh mouse prize (20 years). Something that could show a concrete path towards indefinite lifespan. Calorie restriction doesn't look like it will get us there.
Sorry I wasn't clear.
Saw this on HN.
Live forever: Scientists say they’ll soon extend life ‘well beyond 120’