Immortal Journey: Start with Qi Sword Finger

Why should the life span of Qi training be set lower than that of ordinary people?

Regarding realm performance, abilities, longevity, etc., The author can refer to the settings of other authors For example: the first realm/level, etc.: Mortals (exercise → body training →... (Refer to the martial arts system/guoshu system, etc.) The second realm/level, etc.: Qi training (opening the Dantian in the early stage, conceiving and nourishing after filling, strengthening the human body, attaching external weapons, etc., Quantitative change, qualitative change, then promotion to the middle stage, external release, physical training, life extension (when the individual life is reached) The upper line means cultivating one's character, not getting hurt, living longer), etc., Once again changing from quantitative to qualitative, giving birth to spiritual power, physical prototype, flying weapons, etc., And extending life again (reaching the upper line allowed by the world, depending on the individual life, such as 120-150 years.) Third realm/level:? ... The specific content must be added by the author himself, and the content is for reference only.