Women worry about wrinkles and struggle with dark spots. But a new study brings to light a more subliminal aging cue: a lack of contrast. Scientists at Gettysburg College in Pennsylvania tweaked the tones of facial skin in photos of women 20 to 70 years old, then asked volunteers to estimate the age of each. Turns out, those with minimal contrast (a monochromatic appearance with little color difference in the lips, eye area, and skin) looked the oldest. Makes sense, since with each passing birthday, lips, lashes, and eyebrows naturally lighten.