1. A method of modulating the biological functions associated with the aging process of an elderly or old companion animal, comprising feeding the animal a composition containing nutrients, essentially in accordance with a composition selected from the following compositions A, B and C, calculated on the weight of dry matter :! Nutrient component ABC Crude proteins,% 20.1 19.3 35.7 Fats,% 16.5 16.9 22.5 Calcium,% 0.7 0.7 0.9 Phosphorus,% 0.6 0.7 0 , 8 EPA,% 0.3 0.3 0.2 DHA,% 0.2 0.2 0.3 Linoleic acid,% 4 4 5.1 General N-3 fatty acids,% 1.3 2.2 1, 1 General N-6 fatty acids,% 4 4 5.1 Taurine, ppm 1400 1525 2100 Carnitine, ppm 314 337 367 Methionine,% 1 1.2 1.3 Cystine,% 0.3 0.2 0.5 Manganese, ppm 87 100 104 Vitamin E, IU / kg 1492 1525 1292 Vitamin C, ppm 127 261 141 Lipoic acid, ppm 101 135! 2. The method of claim 1, wherein the biological functions associated with the aging process include inflammation, DNA repair or cell survival, fat or cholesterol metabolism, protein synthesis, cell growth and cell death. ! 3. The method according to claim 1, where the animal is selected from a cat and dog. ! 4. The method according to claim 1, where the composition contains! at least one omega-3 polyunsaturated fatty acid selected from docosahexaenoic acid and eicosapentaenoic acid; ! at least one antioxidant; and! at least one nutrient selected from choline, manganese, methionine, cystine, L-carnitine, lysine, and mixtures thereof. ! 5. The method according to claim 4, where the omega-3 polyunsaturated fatty acid in the composition is DHA and where the composition contains at least about 0.02% by weight of DHA based on the weight of dry matter. ! 6. The method according to claim 4, where the omega-3 polyunsaturated fatty acid in the composition is DHA and
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