It may be a life span thing, or a stress thing.
You know trees move in a very slow time cycle. If exposed to drought, they may not show damage for a while, even years, and then begin dying later.
Also if yours shows yellowing leaves this may signal chlorosis which is a lack of iron in the soil, which then impairs photosynthesis in the leaves.
I'd get a tree specialist to look at them. It might be easy to fix and prevent (if it is a nutrient problem).
Sometimes it is a disease. Sometimes it is just their "time".
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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