The hair that is transplanted to the areas of the scalp where hair is lost tend to be resistant to the hormonal changes that cause the hair loss in those areas. Therefore, while those transplanted hair follicles that grow are expected to remain with age, those hair follicles which are native to the area remain sensitive to hair loss signals and can continue to be lost over time. Hair restoration surgery seeks to predict the most likely pattern of continued hair loss and hedge against it with the transplantation of hair follicles.