All transitions in life are all equally valid. from infancy to youth, to old age. And while being young has obvious physical components attached to it, youthfulness does not. The great Daoist sage Lao Zi, 老子 literally means old child. Because aging is a phenomenon that has to do with the mind just as it has to do with the body. There are plenty of exemplary figures who maintain great vigor and vitality, more so than most "young people". Sure they perhaps can't do what they could when they were a tad younger, nevertheless, they display an admirable type of vitality, of life force.
Of course, one has to adopt different habits as one progresses through life, one can't pull all-nighters as easily, but honestly all nighters no matter the age are horrible for one's health, and if one wants to be healthy just for that and drinking or partying, etc.. then one doesn't understand what it is to age gracefully and how to conserve oneself. There is a great tradition called yang sheng 養生, which means nourishing life, one's own. And a significant factor of doing so is harmonization with the cycles of time, which include doing things at regular hours, and having a consistent circadian rhythm aligned with evolutionary instinct. It is no coincidence those who work night shifts have a higher rate of metabolic diseases because of going against the current.
If one wants to really go against the current of aging, one needs to make sacrifices and abandon behavior that harms one's life in the long run. This is more than just nutrition, or taking the new supplement or doing the next fad exercise, no it also has to do with changing one's mind and heart, not be so rigid and being in many ways like a child again. A mind like spring, which is synonymous with growth, at this point in time of course, in winter it is best to conserve and be more introspective.
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