Popsugar Beauty Skin Care Makeup Mistakes You Didn't Know 20 Beauty Mistakes You Need to Stop Making Right Now 19 September, 2018 by Emily Orofino View On One Page Photo 17 of 21 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 17 Keeping makeup for too long. If you're using an eye shadow you had in high school and you're anything but a college freshman or sophomore, throw it out! Makeup expires in anything from a few months to less than two years. Previous Next Start Slideshow Skin CarePinnableMakeupBeauty TipsNew Year's Resolutions