On Youth, Old Age, Life and Death, and Respiration

On Youth, Old Age, Life and Death, and Respiration (Greek: Περὶ νεότητος καὶ γήρως, καὶ ζωῆς καὶ θανάτου, καὶ ἀναπνοῆς; Latin: De Juventute et Senectute, De Vita et Morte, De Respiratione) is one of the short treatises that make up Aristotle's Parva Naturalia. == Structure and contents == === Place in the Parva Naturalia === In comparison to the first five treatises of the Parva Naturalia, this one and On Length and Shortness of Life, while still dealing with natural phenomena involving the body and the soul, are "definitely biological rather than psychological." They are omitted from the Parva Naturalia commentary of Sophonias.

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