Three sections marked by the hairline, glabella, nose tip, and chin tip.
The first thing gwansang does when reading a face is divide it into three vertical sections. These three sections are called the Samjeong (三停, Three Zones). From top to bottom, they're the Upper, Middle, and Lower Zones.
The boundaries are exact. Upper Zone runs from the center of the hairline to Glabella; Middle Zone runs from between the brows to Nose Tip; and Lower Zone runs from above the philtrum to Chin Tip. Here's one useful trick — measure vertical length, not width. Whether your face is narrow or broad doesn't matter; you're only measuring how much vertical space each zone takes up.
This zone was traditionally read as the seat of early life. It was where one's inborn circumstances, education, and the support of elders were read.
This zone was traditionally read as the seat of midlife. It was where willpower, decisiveness, follow-through, and relationships with the people close by were read.
This zone was traditionally read as the seat of later life. It was where patience, endurance, and relationships with juniors and successors were read.
Classical readers mapped the three zones onto life's three stages: the Upper Zone to early life, the Middle Zone to midlife, and the Lower Zone to later life. That said, the age boundaries vary by school of thought. The table above uses the common before-25 / 26–50 / 51-and-after breakdown, but a 15–30 / 31–50 / 51-and-after version is common too. So it's better not to read it as "at this exact age, this exact thing happens"
A far more useful way to read it is this — which of the three zones stands out. It isn't about which stage is good or bad, but about how this person tends to put their strength to use. When the three zones are even, that was read as a balanced type, with no single stage pulling all the weight.
What you pick gets saved, and we'll bring it all together in the final Overview chapter. You can always change it later.
If you picked one, the first piece of your puzzle has been saved. From the next chapter on, we'll add one part at a time.
For reference and entertainment, based on traditional physiognomy. It doesn't rank appearances or reveal a fixed fate.