What does the use of the phrase grizzled hair suggest

add me on snap   tschrake20

6  then the  lord  said to cain, “why are you angry?   why is your face downcast?   7  if you do what is right, will you not be accepted? but if you do not do what is right, sin is crouching at your door;   it desires to have you, but you must rule over it.”

8  now cain said to his brother abel, “let’s go out to the field.”  while they were in the field, cain attacked his brother abel and killed him.

in his speech "i have a dream," king states the plight of african americans, as he argues that after the civil war, slaves were promised equal rights and freedoms, but that these promises have not materialized.

he goes on to say that there are those who ask "when will you be satisfied? " implying that african americans alread enjoy a lot. in order to attack this argument, king lists examples of civil rights struggles that african americans still face, such as police brutality, segregation and racial prejudice.