Mistake #4: Finishing with Powder
Youthful skin reflects light. Powders prevent light reflection and tend to magnify lines in the skin. If powder has been the final step of your makeup routine since high school, it can be difficult to quit cold-turkey. Here's a three-step program: First, switch to a very sheer translucent powder (like Laura Mercier Loose Setting Powder, $35; lauramercier.com). Then, start using it only on your nose and chin. Finally, trade the powder for a packet of blotting tissues—use one, only on the T-zone (nose, chin, and forehead), if you're shiny midday.