4 Fascinating Things Every Woman Should Know About Gray Hair

Caucasians tend to have the most premature graying, says Binh Ngo, MD, a clinical associate professor of dermatology at USC's Keck School of Medicine, usually seeing some gray by the time they hit their 30s. People of Asian descent typically start to see some gray by their mid-30s, and African-Americans don't start to see gray until their mid-40s.