Answer: By your description of the fruit, I'd guess your tree is a quince. Fruiting quince has thornless branches, and flowering quince has thorns. So, if your thorn apple tree has no thorns, it's probably a quince. The fruit is inedible raw but useful in making jams and jellies. The fruit usually ripens in late September to early October. At 25', your quince has reached its mature height.
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