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Paving slabs for a public foothpath. No work has been done outside in the last few years as far as i'm aware. I've been told that birch trees don't live too long but these ones are at least 40 years old, probably nearing 50. The leaves look fine to me.

For context, the tree is about 40 years old and I can confirm there has been no fire damage, lightning strike upon it etc. I have another birch tree a few metres away and that doesn't appear to have the same thing going on. Just wondering what it is and if i should be concerned about it. The trees are huge and I worry a little in case they randomly collapse at some point, especially as they overhang a public footpath. Any advice would be appreciated. I know nothing about trees in general, they were here when we moved in and I wouldn't know the signs of a dying tree from a healthy one. Thank you.