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In order to investigate the effects of aging on the expression of <i>Mic60</i> and <i>OPA1</i> and mitochondrial morphology in plateau animals, the expression of <i>Mic60</i> and <i>OPA1</i> genes and proteins, and the morphology of mitochondria in the myocardium of adult and aged Tibetan sheep were investigated. The expression of <i>Mic60</i> and <i>OPA1</i> genes and <i>OPA1</i> protein were higher (<i>p</i> < 0.05) in the myocardium of adult Tibetan sheep than in those of the aged ones. The number of mitochondrial cristae in the myocardium of adult was higher than that in aged (<i>p</i> < 0.05). The density of mitochondria in the myocardium of adult was higher than that in aged (<i>p</i> < 0.01). Compared with the adult Tibetan sheep, the mitochondrial crista of aged were relatively sparse, the crista membrane was wide, and the mitochondria were not closely linked, showing fragmentation. These results suggest that the myocardial mitochondria of the adult have better energy supply ability, indicating that aging can lead to the weakening of oxygen supply in the myocardial mitochondria of Tibetan sheep.