Does Makeup Expire? Could you still use it after 4 years?

Cleaning out my closet, I've found these make-up that i've only used once. They're the make-up i bought from Lancome, Estee Lauder, or just random ones i buy from the drug stores. Is it okay for me to continue using them? Or would it be bad for my skin? It includes everything from mascara, lipgloss,... show more Cleaning out my closet, I've found these make-up that i've only used once. They're the make-up i bought from Lancome, Estee Lauder, or just random ones i buy from the drug stores. Is it okay for me to continue using them? Or would it be bad for my skin? It includes everything from mascara, lipgloss, eye shadow, blush, eye liners, lipstick, everything!
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