Regarding the reincarnation theory, evolution theory, and personality/behavioral psychology Natural hair color at birth indicates a time period in a person's life. This is not meant to be racist. Legend (Rough estimate): Blonde - Young, lively, not as intelligent, not fully matured. Orange - A rapid change occurs, active ages, searching for their purpose/careers/friends Brown - Peak rapid intelligence, knowledgeable, experiencing life, carrying out career/purpose Black - Settled down, experiencing life, knowledgeable, intelligence, pursuing career/purpose White - Wisdom rises, purpose found in life, seeking final destination of enlightenment. Can also classify under seasons of a year: Spring/Summer = Blonde/Orange Summer/Winter = Brown/Black Winter/Winter = Black/White Due to many factors not yet provable, an approximation of natural selection can be debatable. Our next reincarnation may be the next step in evolution, whatever we have carried out these past millenia.