Who wants to live forever?

New research shows that increased intake of branched-chain amino acids (leucine, isoleucine, valine) can raise the median lifespan of mice by 12%. Take care to note that the MAXIMUM age at death was not raised, but the average age at death.
It is thought they act by increasing productivity of mitochondria and staving off the ravages of reactive oxygen species (ROS), which are implicated in DNA damage and disruption of cellular function.

After a little searching I found that BCAA supplements have been available for bodybuilding for some time, and although it isn't the fountain of youth, it may be beneficial.