When talking to people of a certain age, you’ll often hear the refrain that “aging is a privilege.” To someone in their 20s, or even 30s, this may seem like a lame platitude — something old people say reflexively, almost defensively, when they hit their later years. In the beauty world especially, age is the final frontier, and to the many people interested in preserving a youthful appearance, few good things happen after the age of 50 — or so they’ve been led to believe.