Turtles are large in size, and the body length of normal turtles will reach 80-200 cm in adulthood, but there are many species of turtles, and different species have different body shapes. Like the common green turtles in coastal areas of China, the body length will reach 80-150 cm in adulthood. Of course, there are also larger turtle species, such as leatherback turtles, whose average body length will reach about 200 cm in adulthood, and some larger ones can reach more than 200 cm.

Generally speaking, wild turtles are larger than captive turtles, but their living environment also has a great influence on their size. If the food is abundant and the environment is comfortable when rearing artificially, their body size can also develop very large. If they live in the wild, but the environment is polluted, they will not develop very big.

The life span of sea turtles is relatively long compared with other tortoises and water turtles. They can generally live for about 120-200 years, but different varieties have different lifespans. Like green turtles living in coastal areas of China, the average life span is about 100 years. At present, the longest life record is 152 years, and the average life span is about 120 years. Like other species of sea turtles, the life span is generally more than 100 years, and some can live to more than 200 years.