It may be time to spring clean your cupboards. That moisturiser at the back of the cupboard that has probably been there for a few years is not going to do any good to your skin, Every so often, maybe once a year, I go through all my cupboards and get rid of any products that I no longer use or can't remember the last time I used them! A good clean out will stop you from using old products when you run out of the new stuff.

OrganiseYourLife gives a rough outline of how long you should keep things for.