The longest-living animal is the glass sponge, which can live for up to 10,000 years, making it one of the oldest known creatures on Earth[1]. Additionally, the Antarctic sponge is remarkable for its lifespan, with estimates ranging from 5,000 to 15,000 years[1].
In terms of vertebrates, the Greenland shark holds the record, with a lifespan of 300 to 500 years[2][3][4]. Meanwhile, the immortal jellyfish can revert to its earlier life stage, theoretically allowing it to live indefinitely under the right conditions, living over 500 years[3][4].
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