KGB-1 activation in different ages causes a robust gene induction. FOS-1 is an essential activator for KGB-1-dependent age-invariant gene expression. FOS-1 mediates a regulatory feedback loop in KGB-1 signaling. FOS-1 acts in parallel to DAF-16 in mediating KGB-1-dependent gene expression. DAF-16 mediates age-dependent contributions of KGB-1 to stress resistance.