What can an 18 year old male do to avoid hair loss?

You need to check all your family line father and mother too.  Androgenetic alopecia can skip generations. Another thing is good to have some blood lab work, to rule out something else besides the genetic role. When we see patients loosing their hair like crazy at a very young age is a must to fo that. Also to examine the scalp and make the right decision and leave you of course with the best therapy!

Youcan see an endocrinologist to find out if there's a hormonalimbalance that is causing the hair loss. Treatment could includeRogaine, PRP, progesterone, spironolactone. Please see an expert.Best, Dr. Emer

I am sorry to hear about your difficulties, and can certainly understand how early signs of hair loss can be disconcerting. Hair loss may be the result of a variety of different causes, ranging from natural genetic predisposition to medical conditions like autoimmune disorders or thyroid problems, but genetic hair loss can certainly start early for certain people.  In fact, an estimated 16% of boys do begin to experience male pattern hair loss, or androgenetic alopecia, when they are between 15 to 17 years of age. Because the condition occurs when hair follicles have an innate sensitivity to DHT, a byproduct of the breakdown of testosterone in the body, it is not surprising that it would grow more noticeable when those male hormone levels spike during puberty. Although the condition is inherited, the genes contributing to hair loss can come from either your mother or your father and may be dormant for several generations or affect individuals to varying degrees, so you could reasonably be experiencing genetic pattern hair loss even if no one in your immediate family exhibits it.

Although you said that you had consulted your doctor, I might also recommend that you seek a second opinion from a board certified dermatologist with experience treating various forms of hair loss.  While androgenetic alopecia does account for more than 90% of all cases of hair loss experienced by men and women, there are also other causes of hair loss that could potentially be linked to more serious medical conditions. A thorough examination and diagnosis by an experienced hair loss specialist can determine with certainty what is causing your hair loss and what might be the best course of treatment. 

All the best,

I understand how frustrating it is loosing hair being so young.I will recommend that you consider a treatment to reduce the speed/stop your hairline from going further back. Treatments such as Propecia/Rogaine or PRP (Platelet Rich Plasma) are proven to be very effective. The use of non surgical treatments is to be continued for life and will not restore your previous hair line but will help you maintain your existing hair. Your hair loss can be genetic, stress related or a medical condition.PRP (Platelet Rich Plasma) is one great option. This procedure consists on getting some of your blood and putting it in a machine that will separate the different ingredients that are in the blood. From those ingredients we take the growth factors and inject them in your scalp. These growth factors will start working in your follicles enhancing your hair and reducing (and even stopping) the rate of your hair loss. If your follicles have not been dormant for too long the hair can regrow. We are here to help you look and feel good.  Best of lucks!

that is young to start losing hair, but don't lose hope. I would see an endocrine specialist first to check hormones and get started on Propecia which will help.