Q.50+-year-old Tangelo Tree With Yellow And Brown Leaves?
50+-year-old tangelo tree with yellow and brown leaves? What can I do to improve the health of this tree? The leaves that are turning yellow and brown seem to be newer leaves although some of the old ones are as well. Please help!

Certified GKH Gardening Expert
That is very, very old for a citrus tree. Many citrus top out around 40 to 50 years before starting a very quick decline.
This article will help you to give it the best care while you see it out:
https://www.gardeningknowhow.com/edible/fruits/tangelo/tangelo-tree-information.htm