Graying of the hair and mortality.
D000328:Adult; D000368:Aged; D000375:Aging; D005260:Female; D006197:Hair; D006801:Humans; D007198:Indians, North American; D008017:Life Expectancy; D008297:Male; D008800:Mexico; D008875:Middle Aged; D009026:Mortality; D012737:Sex Factors; D013030:Spain / Q000208:ethnology