Androgenetic alopecia, also known as seborrheic alopecia, usually falls out between a few years to a few decades. However, the exact duration of hair loss depends on the severity, duration of the disease and individual constitution. Androgenetic alopecia is caused by disorders of androgen levels. It is mainly characterized by thinning and greasy hair. The speed of hair loss is related to various factors such as heredity, severity, duration of the disease, and personal constitution, so the time of completion of hair loss is not certain, but it is usually completed between a few years to a few decades. Androgenetic alopecia will affect your daily life to a certain extent, so once hair loss occurs, you can go to the hospital in time for examination and diagnosis, and choose the appropriate treatment to improve under the guidance of the doctor.