Don't forget your decollete, as its likely to be more exposed to the sun. Get into the habit of treating your neck and chest to everything you do to your face- from exfoliating, to using an anti-ageing cream, to sun protection. You could also invest in a neck and chest specific product such as This Works Perfect Cleavage, an anti wrinkle serum that nourishes and firms and gives a skin-flattering shimmer.