Here is a photo

That might indicate a disease or nutrient deficiency but knowing your location could help. If you're in the southern hemisphere and autumn is near it may just be normal leaf color changing before they drop. Also, I don't see any fruits on the tree which are normally left to ripen as the leaves turn to fall colors. Below is a pic of our tree back in the fall...the fruits have already been havested...

Thank you. I am in southern hemisphere. The local birds have devoted the fruit on the outermost branches.

My variety is a non-astringent type in the Ichi Ki Kei Jiro family, it's about 17 YO in that pic above. Oddly this is the only fruit tree we grow which is not bothered by pests of any kind. Birds, squirrels, deer, bugs, possums, skunks (we have them all) nothing bothers the tree or fruits all season long. It's as if the tree is invisible. The critters listed above do go after the plums, cherries, apples, pears, figs, and blueberries, but not the persimmons, which is so strange.

If this is going to be your first harvest they keep well in the fridge for about 2 months before getting too soft for me. If your tree is the non-astringent type then once they turn orange they can be eaten on the firm side. To me they have a nice mild tropical flavor. Happy Harvest!