The Methuselah Foundation, which sponsors the Mprize for increasing the life span of lab mice, as well as other anti-aging research activities, has recently gotten a number of supporters.
Is it a space prize? It's close enough to get covered here ... I guess if you've read space-related stories with characters with long lifespans (eg: some Heinlein stories), or considered what it might take to get to other stars, the connection gets closer. Then, if you see some of the space-related donors to the prize, the connection gets stronger still. This prize also fits the model of an innovation incentive prize that I usually (but certainly not always) focus on.