The first stage of upgrades to the fleet should be complete by 2013, which will include improved electronics and lifespan extensions.

But he insists that "an honest discussion of lifespan extension must include consideration of tradeoffs."

This lifespan extension, of about 15-16 percent, is observed only in male mice.

Kaeberlein and co-workers have questioned the hypothesis that lifespan extension from caloric restriction is mediated by Sirtuins.

Genetic modifications in other species have not achieved as great a lifespan extension as have been seen for C. elegans.

Sir2 deletion prevents lifespan extension in 32 long-lived mutants.

David A. Sinclair is a biologist best known for his research on the biology of lifespan extension and driving research towards treating diseases of aging.

Powers et al. showed a dose-responsive effect of rapamycin on lifespan extension in yeast cells.

Even though people are living longer and longer it would take a lifespan extension beyond most scientists' forecasts for any one individual to live throughout the entire trip.

The protesters were also opposed to lifespan extensions for three existing nuclear plants.