When it comes to treating the signs of aging, many women used to take a wait-and-see approach. As in, wait until they see a wrinkle or age spot, then do something about it. Not anymore.

According to dermatologist Harold Lancer, MD (whose Beverly Hills office is frequented by Kim Kardashian, as well as Margot Robbie and Brie Larson), his twenty- to thirtysomething patients have learned from their mothers and become the what-if generation.

As in, “I may not have forehead lines now, but what if I get them when I’m 40?” Here’s how they’re taking steps to slow aging skin.