Hair loss is a common problem of the growing age. Both men and women after reaching their middle thirties start experiencing the loss of hair from the crown and temple regions of the head. At this stage, the growth of the hair nearly stops or becomes considerably slow. It starts by thinning of the hair followed by prominent hair loss which makes the bald scalp noticeable. The main cause of slow hair growth process is the excess release of the hormone called dihydrotestosterone, DTH. This hormone is predominantly responsible for making the texture of the hair follicles thin until they start shedding eventually. Other important cause of the inhibited hair growth is the lack of iron among the aged people. Stress factor especially after suffering from an illness is yet another factor that decides the growth of the hair. 

Further, hormonal changes also leave adverse impact on the growth of the hair to some extent. This is especially seen among people who have a hyper-active or under-active thyroid gland. The excessive release of male or female hormones called androgens and estrogens at old age stop the growth of hair. In addition, the side effects of certain medicines, which are a part of necessities in old age, can also cause the slow growth of hair among people.