Nanobots seem to be well on their way to drastically expanding human life. Clusters of them are already regenerating the spinal cords of mice (Project, 2007), and soon it should be possible to program them to repair all of our aging and defected cells (Lindsay, 2005). But nanotechnology is not the only thing in our favor. Scientists have recently even begun to conquer the telomere problem (Mann, 2009).

By making the lifestyle changes known to be currently effective towards extending vitality, such as cutting sugar intake, we may yet live long enough to live forever. 

References:

Lindsay, J. (2005). Inventor Sets His Eyes On Immortality. Retrieved May 30, 2009 from http://www.msnbc.msn.com/id/6959575/

Mann, H. (2009). The Egg: Fountain Of Youth For Sperm. Retrieved May 30, 2009 from http://www.science20.com/alternate_allele/egg_fountain_youth_sperm

Project on Emerging Nanotechnologies (2007). Nanotechnology Offers Hope. Retrieved May 30, 2009 from http://www.nanotechproject.org/news/archive/nanotechnology_offers_hope_f...