The Compendium of Caraka 1.11.4_2

1.11.4_2

tasyānupālanaṃ---svasthasya svasthavṛttānuvṛttiḥ, āturasya vikārapraśamane 'apramādaḥ, tadubhayametaduktaṃ vakṣyate ca; tadyathoktamanauvartamānaḥ prāṇānupālanāddīrghamāyuravāpnotīti prathamaiṣaṇā vyākhyātā bhavati //

Its preservation consists in: following the regimen for the healthy by a healthy person, and vigilance in alleviating disorders in a sick person. Both of these have been spoken of and will be spoken of. One who conducts oneself as prescribed obtains a long life through the preservation of life; thus the first desire has been explained.