What works when you’re 20 usually doesn’t work when you’re 40—whether it’s your food choices, your ability to rebound from a hangover (enter the two-day recovery!) or how you apply your makeup. When it comes to cover up, our needs shift over our lifetime. The formula you used to cover your teenage breakouts is decidedly not the one you want to layer beneath your 30-something eyes to disguise your baby/work/social life-induced sleep depravation.The good news? Thanks to major innovations in the concealer department, simply adjusting your approach to the shifting needs of your skin can have you looking vibrant, no matter your decade. We asked Sandy Linter, celebrity makeup artist and Lancôme’s Beauty At Every Age Expert (who is incidentally looking damn good at 65) for her best concealer-blending tips for skin of every age.QUIZ: Does Your Skin Look Older Than it Should?Concealer in Your 20sLate nights up studying, working or out on the town with friends can often cause the undereye darkness or breakouts that this age group is most often reaching for concealer to cover. “Lucky 20-somethings can use a thick, rich concealer as lavishly as needed,” says Linter, who suggests stick concealer. Free of wrinkles at this time in your life, you can enjoy the benefits of full coverage without having to worry about makeup settling into fine lines. You may even opt to skip foundation and only use concealer where needed, says Linter, who adds that choosing a shade too light is the most common mistake among this age group. Pick a color just slightly lighter than your tone, pat down with your fingertips, and dust with a light application of powder to set.