I don't have hair loss - follicles have been constantly less in number (even when I was 10). What's wrong? (photo)

Thanks for sharing. If you've truly had low density all your life (before age 8), you likely have one of the many hereditary or hypotrichosis syndromes, genetic syndromes, or hair shaft issues (with the third diagnosis being rather unlikely for you).  I'd need to know everything about your history from before your were born, to the day you were born, to your first few years. I'd need to know about your family. I'd need to know about your teeth, nails, sweating, and any illnesses you have now. I'd need to look at your hair under the microscope and see your nails and hands and teeth. The shape of your face, ears, nose and chin help me as well.



Male balding can start age age 8 or 9. However, I'd expect you would have a lot less density if your cause of low density right now was early onset male balding. As you can see it's an extensive processes to determine causes of hair loss in children. But that's what's needed if you have had low density since childhood!. Of course I can't say whether you have male balding now as well. But if you truly had low density from age 3,4,5,6 and 7 I can assure you it's not causes by male balding. 

your best bet is to have a consultation with a hair restoration surgeon who can evaluate your history, scalp and hair, and discuss with you the options available to you, as well as formulate both short term and long term plans.

You need to be analysed by a doctor who can study your hair, count the number of hairs and perform bulk measurements to determine a diagnosis