Why: Tough love, ladies: if you think you can get away with tanning in your 30s, you're fooling yourself. As skin rejuvenation slows down, it's harder for us to recover after a sunburn, so dehydrated skin stays wrinkled and sunspots darken. Just skip all of that headache by wearing a daily SPF. Your 40-year-old self will thank you!
Try: Sometimes it gets confusing whether to apply sunscreen before or after foundation. Eve Lom made this all easy by launching the Flawless Radiance Primer + SPF 30 ($55). This sheer layer is worn underneath foundation, so you'll be covered on every level. And it feels deliciously silky against bare skin!