[Maru]

Very sad, but 400 years is a very long time for any tree... I love our oak and if anything happened to it, I would probably be depressed. So I can understand if a tree is a fixture and a core part of someone's life, its loss is felt very much by some.

I'm not an expert, and it's hard to say by the photos, but I can see spots where it looks like it is declining significantly. One would hope steps were taken before that point to be able to try to save it because that doesn't happen overnight.