I realize that individuals vary greatly, but is possible to determine, from measuring a person’s facial proportions, where their natural hairline, prior to any hair loss, should be? i.e. how far up the forehead should it be located.
Each and every patient is different but in general a male hair line usually starts around 1cm or so above the highest crease of the furrowed brow. To see this, look in the mirror and lift your eyebrows. That crease will show up well unless you had Botox done. We can go in to facial geometry and proportions and there are books and papers written about this. But you can start with the basic. We’ve also written about the Juvenile Hair line regarding this topic over the last several years here on Balding Blog. Use the search bar (upper right corner).