I have a 40 ft "volunteer" peach tree. The peaches take forever to ripen. They are still completely green in July!
The birds don't wait for ripening, they peck holes, then the
bees, wasps and beetles start in on the holes. If I want to eat a peach I have to chew around the bad parts. Thats if I can find some that actually had time to ripen.
I usually just pick up what's on the ground, cut off the good parts and freeze in small one serving zip locks to make compote for French toast.