Q: Why do some people have a full head of hair into their seventies or eighties and others start to go bald in their late teens or early twenties?
A: The difference is genetic with the inheritance coming from either side of the family.
Although a person will have the genes his/her whole life, a gene’s expression (also called phenotype) can be quite variable. The factors that cause this variability is still unknown.
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Topic: Hair Loss
Tags: Age, Family History, Genes, Genetic Hair Loss, Genetics, Hair Loss, Phenotype
Posted by Robert M. Bernstein M.D. at 6:26 am
