Youshful ((free)) -

This is the most sustainable form of youthfulness because it relies on internal habits rather than external products. 3. The "Youthful" Aesthetic Trend

Youthfulness is the retention of wonder. It is the ability to look at a common object—a falling leaf, a spiderweb in the morning light—and see it as if for the first time. While the body may succumb to the inevitable stiffness of time, the youthful spirit remains pliable, curious, and unjaded. It is the opposite of cynicism; where the cynic says, "I have seen this all before," the youthful heart asks, "What is this, and what can it become?" youshful

There is a growing "youthful world" aesthetic in media and fashion: This is the most sustainable form of youthfulness