Some of our bathroom staples are on the shelf for what seems like forever! Here is a time-line guide of when you should replace some of them: body lotion 2-3 years (pumps last longer!), shampoo, conditioner, and shower gel 3 years, mascara and liquid eyeliner 3-4 months, lipstick and lip gloss 2-3 years, foundation 2 years, hairstyling products 3-5 years. If you can’t remember how old it is, toss it!