For the longevity, it's just the perfect environment in the White Mountains. Trees don't die of old age. Pests, disease, and erosion are what kill them. That area, being California high desert, there just aren't really any pests or disease. Erosion and weather are the biggest threat to the trees.
That place is totally cool, in that I really like it but don't think anyone I'd drag up there would enjoy it as much, ha.
https://www.atlasobscura.com/places/the-bristlecone-pines-of...
Could be done around now-ish in snowshoes as well.
One of the least visited and most beautiful national parks in the US! Sparkling stars and dark skies make for great meteor viewing, and the bristlecone pine trail has a loop through all the interesting trees with little signs and "biographies" about each tree.
One of the largest is Prometheus: https://www.nps.gov/grba/learn/historyculture/the-prometheus...
Question of definition whether clones are the 'same individual organism'.
More details here. https://en.wikipedia.org/wiki/List_of_longest-living_organis...
Then there's this possibly immortal jellyfish.
Meanwhile the oldest known living tree is a still astonishing 4,800 years old
https://en.m.wikipedia.org/wiki/Methuselah_(tree)