There is no animal that does not age. All living organisms, including animals, experience a process of aging called senescence. This process is characterized by a decline in the organism's ability to function and repair itself over time.
However, some animals exhibit slower aging rates or have longer lifespans than others. For example:
- Tardigrades, also known as water bears, are microscopic animals known for their remarkable ability to survive extreme conditions, including radiation and dehydration. While they do age, their lifespan can be extended by entering a state of suspended animation called cryptobiosis.
- Turritopsis dohrnii, a species of jellyfish, has the unique ability to revert to a polyp stage after reaching sexual maturity. This process allows them to essentially "reset" their biological clock, making them effectively immortal. However, this process can be disrupted by environmental factors.
- Giant tortoises are known for their exceptionally long lifespans, with some individuals living for over 100 years. This longevity is attributed to their slow metabolism and robust immune systems.
While these examples demonstrate remarkable adaptations, it's important to remember that all animals ultimately age and die.
