If you intend to hide the grays as you age, the most flattering color will be something close to whatever grew out of your head when you were a toddler, says Johns. To that end, use your childhood color as a guide, but keep in mind that extreme hues (even if you wore them well in preschool) are not flattering to aging skin, says Sharon Dorram of Sharon Dorram Color at Sally Hershberger, in New York City: "Very light hair, like platinum blond, can wash you out, while dark, inky shades can look harsh." To err on the safe side, Dorram suggests starting with highlights, which subtly lighten hair, or lowlights, which subtly deepen it. Both require less frequent touch-ups than all-over dye. Streaks also keep color from becoming too monochromatic (or wiglike).