[delilah]

When is lipstick too old? Is there any other uses for it, I have so many its a lot of money to through out, can it hurt lips, cauce infections etc?

[RickJ]

According to this article, the shelf life is 1-4 years depending on who's giving the opinion:
http://beauty.about.com/od/makeuptri.../shelflife.htm

It notes "What everyone agrees on is that if it smells rancid, throw it out, it's spoiled. It can cause fever blisters"

[PrettyLady]

Delilah, it's good to replace your lipstick every year as bacteria can collect and live on the stick. A change in the way it tastes or smells means to toss it out!