Q.Orange Tree Pests And Diseases
I have an orange tree 39 years old and its bark is peeling off and slowly dying. Is there anything I can do for it? Many thanks

Certified GKH Gardening Expert
That looks to be mechanical damage from an animal or person!
I see, also, what looks to be a fungal infection of the soil, which can be seen on the leaves of the cucurbit at the base of the tree.
With all of that being said- 40 years is an average lifespan of oranges in diseased soils, whereas when perfectly healthy they can survive for much longer.
I would say that the tree is on its way out. You can continue to care for it as it needs to ensure that it lives the rest of its life, fairly, productive.
Here is an article that will help you to care for it:
https://www.gardeningknowhow.com/edible/fruits/oranges/growing-an-orange-tree.htm