Legler, in his estimable study of Terrapene ornata ornata, noted (1960:585) that practically nothing was known about longevity in the species. However, he suggested (p. 586) that a longevity of 50 years might be expected. Blair (1976) marked specimens of T. o. ornata on a plot of 0.93 ha near Austin, Texas, and made observations over 23 years. He was not able to find (p. 96) any evidence of longevity extending beyond the earlier part of the third decade in this population.
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Metcalf et al. (1985) studied this question.