You know you always wondered how long you should really keep that old foundation or those vintage eye shadows. Consider this your definitive guide, and to make sure you know when your cosmetics have seen better days, write the date-of-purchase on them with sharpie.
Mascara: 3 months
Liquid liners: 6 months
Foundation: 6-12 months
Lip gloss: 1 year
Concealer: 1 year
Nail polish: 2 years
Lipstick: 2 years
Powders: 2 years
Eye shadow/bronzer/blush: 2 years
Image via makeup.com