Dreaming that you have gray hairs is a reflection of a very stable personality and that you have self-assurance. If the gray hairs fall out when combing or touching their hair is an indication of insecurity and great fear of old age.
When you dream with canes or that suddenly appears all white hair indicates that the time is coming you to take your things in a more adult way. It is an indicator of maturity that you must deal with situations responsibly.