What animal has the longest average life span

animal?

insect?

tree?

etc. just whatever you know.

These are records, not averages...

Mammal: Bowhead Right Whale 211-245 years
Reptile: Aldabra Tortoise 250 years
Fish: Koi 226 years
Bivalve: Quahog Clam 410 years
Plant: Bristlecone pine 4,900 years
Microorganism: Bacillus permians 250,000,000 years (in stasis)
Insect: Splendor Beetle 47 years
or Queen Termite 50 - 100 years (questionable)

sea turtles over 100 years

unknown

probably Cali Redwood (largest)
but trees are fairly self contained if you leave them alone they can grow forever