Makeup expiration dates

I got curious about makeup expiration dates after getting a few styes on the same eye for the past few months...

Here are my results after I did some intense (15 minutes) research online:

Brushes: must be washed weekly with a mild detergent

Concealer: 12 to 18 months

Cream & gel cleansers: 1 year

Eyeshadow: up to 3 years

Foundation: a water-based foundation will last up to 12 months, oil-based will last up to 12 to 18 months, cream or compact foundation up to 18 months

Fragrance: 2 to 5 years

Lip gloss: 18 to 24 months

Lip liner: Up to 3 years

Lipstick: Some experts say 1 to 2 years, others say up to 4 years or until it smells bad... 

Liquid eye liner: 3 to 6 months

Mascara: 3 to 4 months

Nail Polish: up to 12 months

Pencil eye liner: up to 3 years

Powder: 2 years

Sponges: washed weekly and discard monthly

I guess this is the general guideline I'd be keeping in mind on when products need to be tossed out...

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Update: I found this informative site that can help calculate the date your products was manufactured and therefore find out when your products are due to expire... Check it out :) http://checkcosmetic.net/

07.12.11