It is formed from fresh ginger after being stored and dried for a long time. After fresh ginger is harvested, the water in it will gradually evaporate after being sliced, dried, and stored. The color of the ginger will become darker and the texture will become harder. At this time, ginger can already be regarded as old ginger. Old ginger can also be formed by planting ginger in a suitable environment and growing and nurturing it for a long time. The growth period of this kind of old ginger takes about 10 months, but some can last for more than a year. Therefore, old ginger is formed from fresh ginger after being stored for a long time.