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ty during which graying is probably much more reversible(可逆的)
than had been thought for a long time,"says study co-author Ralf
Paus,a dermatologist at the University of Miami.
Most people start noticing their first gray hairs in
their
30s-although some may find them in their late 20s.The period,
when graying has just begun,is probably when the process is
most reversible,according to Paus.In those with a full head of
gray hair,most of the hair have probably reached a "point of no
return",but the possibility remains that some hair follicles (E
may still be flexible to change,he says.
The team also investigated the association between hair gra-
ying and psychological stress because prior research hinted that
such factors may accelerate the hair's aging process.Stories of
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