That'd would be the largest tree by volume, the General Sherman tree is 52,500 cubic feet.

The tallest tree would be Hyperion, a coastal redwood, which is in an undisclosed location in one of the Redwood National or State parks.

Coincidentally the oldest tree in the world is also in California, Methuselah in Eastern California is 4,851 years old.

Arguably, a spruce in Sweden is 9550 years old.

https://en.wikipedia.org/wiki/Old_Tjikko

Depends how you count regrowing from the roots though. Trees can't be too much older because that's around the end of the Ice Age. ;-)

My personal preference is not for a single tall or big tree as much as a sprawling area full of many huge trees. If you're ever in the far-Northern-California area, this hike is amazing:

https://www.alltrails.com/trail/us/california/cathedral-tree...

The location of Hyperion doesn't seem to be undisclosed.

http://famousredwoods.com/hyperion/

Not quite. I’ve heard of even older than the following quote but it’s in the Longevity book and I don’t have a direct quote handy:

“

Researchers at the Rocky Mountain Tree-Ring Research Group then announced the age of another P. longaeva also located in the White Mountains — this one 5,062 years old

https://www.google.com/amp/s/www.livescience.com/amp/29152-o...