Age Defender Power SerumDefy ageing and plump out your skin with the youth boosting Age Defender Power Serum from Kiehls, it's a powerful treatment that provides a first line of defence against the effects of maturing skin. Crafted to a potent formulation of adenosine, cypress extract and an infusion of proteins, Age Defender helps promote skin firming and elasticity and assist collagen production for a renewed, uplifted appearance.