Réponse Préventive is the line dedicated to the first signs of aging, designed for millennials. It's important to take care of your skin and act preventively when the first signs of aging appear: the earlier you start, the better your skin copes with aging. At twenty, skin is youthful and in tip-top shape, with perfect density and excellent cell production. At this age, the priority is developing good habits to preserve its beauty for as long as possible.