What causes hair to turn gray?
user
It actually depends on the individual, but there are some common patterns.  For example, many people experience graying of their hair starting around age 30.  And older individuals often have gray hair.
assistant
What causes hair to turn gray?
user
It actually depends on the individual, but there are some common patterns.  For example, many people experience graying of their hair starting around age 30.  And older individuals often have gray hair.
assistant
What causes hair to turn gray?