I don't know if this is what you meant by "summary", but Kurzweil's book (co-written with <edit> some homeopath) Transcend (Amazon) is his most up-to-date effort. I've read it mostly and it seems well researched and also explains the science behind its recommendations.

I also thought I'd mention that there are now certain compounds (Wikipedia) which show some evidence of initiating telomerase production in adult humans. If this drug works as well in humans as it has been shown to work in mice, it should significantly increase your healthspan.