It is never too early to start taking good care about the hair, and it is never too late. The old saying is supported by the modern studies, indicating that even on completely bold head, there is still plenty of hair follicles able to initiate hair growth.
Hair care starts with washing the hair.
Selection of a proper shampoo, which will not irritate the scalp in many cases will require continuous trials. With any shampoo, it is essential to rinse thoroughly, to remove the residue of detergents from the hair roots. Even with diluted or soap shampoos, intensive rinse is important, as leftovers of detergents may irritate the scalp and affect hair growth. In fact, remaining detergents quite often are the primary cause of scalp irritation, seborrhea and hair loss. One may be well advised to avoid these, if any symptoms of scalp irritation or hair loss occur.