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For both the young and vigorous and the elderly, their Qi and Blood vary in abundance and deficiency. Qibo stated: "The Qi of Shao Huo (mild fire/warm Yang) is robust; the Qi of Zhuang Huo (excessive fire/pathogenic heat) is deficient." This is because Shao Huo generates Qi, while Zhuang Huo consumes Qi. How much more so for a state of deficient fire, which must not be ignored. Therefore, treatment methods should also distinguish between these levels. The conditions of youth and prime adulthood are naturally distinct. The prescriptions collected by Chen Lingyin were all prepared for the elderly. The content continued here is also compiled and categorized based on prescribing according to the severity of symptoms.

Humans are but one among all things, unable to escape the numerical laws of Heaven and Earth. When Tian Gui (the substance promoting reproductive maturation) reaches its limit, Essence and Blood are exhausted, and Shen Qi (Spirit and Vital Qi) becomes floating and weak. It is akin to a child who relies entirely on care and support to aid decline and nourish the body. If encountering unexpected events such as fire, water disasters, military conflict, or robbery that cause terror, the elderly must first be supported to a safe place to avoid them; they must not be disturbed by noise or busyness. Once an elderly person suffers a great fright, it leads to mental confusion and may give rise to secondary illnesses. They should not be allowed to attend funerals or mourn disasters; they should not be startled when ill and critical; they should not be forewarned of sorrow or worry; they should not eat foul, rotten, or unclean food; they should not consume sticky, hard, or toxic substances; they should not dwell in dilapidated, leaking, low-lying, or damp places; they should not be exposed to sudden storms and cold; they should not suffer from stifling summer heat; they should not exert themselves through walking or movement; they should not overeat at night; they should not go hungry during foggy or dark times; they should not ride borrowed saddles or horses; they should not take remote or obscure medicines; they should not enter abandoned houses; they should not tour cemeteries or graveyards; they should not walk in dangerous places; they should not cross deep ravines or abysses; they should not reside in dimly lit rooms; they should not hear reports of distant disasters; they should not associate with frivolous maids or servants; they should not manage household trivialities. There are many such matters that cannot be fully enumerated. As long as children think deeply and take excessive precautions, avoiding anything slightly inconvenient for the elderly, longevity can be preserved.

The *Si Qi Tiao Shen Lun* (Treatise on Regulating the Spirit According to the Four Seasons) states: "Yin, Yang, and the Four Seasons are the beginning and end of all things, the root of life and death. To go against them brings disaster; to follow them prevents strange diseases; this is called attaining the Dao. Spring warmth promotes growth; summer heat promotes flourishing; autumn coolness promotes harvesting/convergence; winter cold promotes storage. If the climate contradicts the season, all become epidemics. This is the constant way of Heaven. Following it ensures life; opposing it causes illness. The Classics say: 'Observe the Way of Heaven, hold fast to the actions of Heaven, and you have reached the limit.' If humans can grasp the principles of generation and destruction of Heaven's Way, and act in accordance with the movements of the Four Seasons, naturally diseases will not arise, and longevity can be maintained. For those with yellow hair (the elderly), the Qi of the Five Zang Organs is deficient, and Spirit/Essence is exhausted. A slight loss of regulation and ventilation will immediately lead to critical consumptive diseases. Generally, the elderly are too weary and lazy to self-regulate; they rely on others' support to extend their lifespan. Children should carefully observe the elder's cold and heat status, prudently administer herbs, follow the regimens for seasonal care, align with the resting and thriving Qi of the Five Elements, serve parents with reverence and diligence, and never slacken."