Your daily skin care regimen and holy grail products may have shaved five years off your appearance, but if you haven’t been as meticulous in looking after your neck, there’s a good chance it’s been displaying everything your face has been trying to hide all along. Think wrinkles, fine lines and sagging, crepey skin.

How Aging Changes Skin

In your 20s or 30s, keeping wrinkles and fine lines at bay...

Chances are, you’ve heard about the wrinkle-reducing benefits of retinol, but might not understand exactly what this hero ingredient is—or everything it can do for your skin. In essence, retinol belongs to the class of ingredients known as retinoids, which are derived from vitamin A. Retinol works to stimulate collagen production and accelerate skin turnover, smoothing fine lines and wrinkles and...