The average life span of octopus is about 3 years. They are soft marine organisms, and their specific life span will be affected by their growing environment. If octopus live in a comfortable environment and are not caught, they can live for about 4 years, but no more than 5 years at most. If it is an octopus cultured artificially, its life span will be shorter, generally within 3 years. Because the farmed environment can't completely simulate the ocean environment, and the food fed is not rich enough, their life span will be reduced. In addition to the environment in which they grow, the species of octopus also affects their life span. Like giant octopuses, their life span will be shorter.

There are many species of octopus, and their body shapes are also different. According to statistics, there are about 600 kinds of octopus in the world. Different species of octopus have different sizes in adulthood, like some smaller octopuses, such as arbor octopuses, which are about 5 cm long in adulthood. There are also some larger octopuses, such as the Pacific octopus, which spread their tentacles completely in adulthood, with a diameter of 7.8 meters. The weight of this octopus is also very high, reaching more than 100 kilograms. So how big octopus can grow depends on their species.