Document Detail

Greying of the human hair. A worldwide survey, re-visiting the "50" rule of thumb.
MedLine Citation:
PMID:  22716034     Owner:  NLM     Status:  Publisher    
Background:  While numerous papers has reported on the biological mechanisms of human hair pigmentation and greying, the epidemiological descriptions of both natural hair colour and greying process, worldwide, remained poorly documented. Objectives:  This study aimed on a first hand at assessing hair colour and greying in a large world sample of human subjects. On a second hand, it aimed at re-visiting the validity of the 50/50/50 rule of thumb, stating that "at age 50, 50 percent of the population has at least 50 percent grey hair". Methods:  The natural hair colour of 4192 healthy male and female volunteers was assessed using a sensorial expert evaluation through the comparison of each volunteer's hair with standard swatches. Hair colour was studied according to age, gender and ethnic or geographic origin of the volunteer. Results:  In overall we observed that between 45 and 65 years of age, 74% of people were concerned by grey hair with an average intensity of 27%. Males harbour significantly more grey hair than females. Both age of onset and rate of greying with age hair appeared being clearly linked to ethnic/geographic origins. Subjects from Asian and African descent show less grey hair than those from Caucasian's, at comparable ages, confirming previously reported data. Conclusions:  Calculating the percentage of people showing at least a 50% grey hair coverage at age 50 age, leads to a global range of 6% to 23%, according to ethnic/geographic origins and the natural hair colour, appearing well below that expressed in the "50" rule of thumb.
S Panhard; I Lozano; G Loussouarn
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-20
Journal Detail:
Title:  The British journal of dermatology     Volume:  -     ISSN:  1365-2133     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0004041     Medline TA:  Br J Dermatol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 British Association of Dermatologists.
L'Oréal, Research & Innovation, Saint-Ouen, France.
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