At any given age or any stage of hair loss, there are 30% more hair follicles which are non-functional but still not dead.
The areas where at present you can see some hair growths are where these 30% follicles are found. Hence, you can get new hair growth at any age and any grade of hair loss within the hair bearing areas not where the hair is receded or disappeared leaving a shiny bald spot. Follicles in shiny bald areas are dead and none can come alive.
