Husband told me that he'd heard that an average adult arm span (from fingertip to fingertip stretched out I mean) could surround a tree that's 75 years old. So I had to hug a tree, didn't I?
The biggest/oldest one we could find must have been about 150 years old. Which means it would have seen all the industry that used to be in the woods: the coal mining, brick making and arsenic ... um ... factory. It's all gone now leaving a beautiful valley that nature has reclaimed.