http://www.methuselahfoundation.org/
Here is an area that I really support... even if it just improves the quality of my life at the end, it would be nice to see humans break the supposed fundamental limitations of our short existence.
Honestly, I think your financial contribution is just as important, as it will help bring more people around to the belief that something can be done about it, and also enables more scientists to work on it through grants provided by the institute.