Scientists at Israel’s Weizmann Institute have discovered that the protein interferon beta impairs the cognitive ability of the brain – common in old age.  The finding may lead to treatments that can prevent or reverse cognitive decline and rejuvenate the brain.

http://wis-wander.weizmann.ac.il/scientists-identify-the-signature-of-aging-in-the-brain#.VDQ5LVeGfB8