Born Old: Animals That Age in Reverse or Barely Age at All. AI-Generated.
The Immortal Jellyfish (Turritopsis dohrnii)
This jellyfish isn’t just a sea creature — it’s a biological mystery. Known as the immortal jellyfish, Turritopsis dohrnii has the unique ability to reverse its own aging process. When faced with stress, injury, or starvation, it doesn’t die. Instead, it reverts to its earliest form — a polyp — and begins its life cycle all over again.