The age models established by the growth ring and carapace length or carapace width predict that the large tortoise (carapace length>180mm) may exceed 24 years in field populations of Xinjiang. The expected longevity would be 28 years.

• 30:34(1991),成体龟数目远大于幼体龟的数目,利用年轮与背甲长度或体宽建立年龄模型,模型显示相同年龄的四爪陆龟,雌体生长速度大于雄体,通过年龄模型推测,背甲长度超过180mm的野生四爪陆龟的年龄可达24年,估计四爪陆龟的期望寿命为28年。