三线闭壳龟的性成熟年龄因性别的不同而有差别。野生的雌性龟,性成熟年龄为6～7年,体重1250～1500克,雄性龟为4～5年,体重700～1000克。雌龟背甲较宽,尾细且短;泄殖腔孔距腹甲后缘较近,腹甲后缘两块肛盾形成的缺刻较浅;反之,背甲窄且长,尾长且粗,泄殖腔孔 Sexually mature age of the three-line turtle turtle varies according to gender. Wild female turtles, sexual maturity age of 6 to 7 years, weighing 1250 to 1500 grams, male turtles for 4 to 5 years, weighing 700 to 1,000 grams. The female turtle carapace wider, tail thin and short; cloaca foramen proximal to the posterior margin of the plastron, the posterior margin of the plastron two pieces of anal shield to form a shallow notch; the other hand, the carapace narrow and long, tail length and coarse, cloaca hole