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Somebody here told me they planted an avocado seed and got fruit in five years. Is that a possibility? I have several cado trees I planted from seeds that are over 7 years old now. Very large trees now but no fruit yet. I've always understood it can take 10 to 15 years.
(The fruit wasn't any good.)
Good chance they will never fruit. If they're healthy, you might look at getting some scions and grafting something you know will fruit onto them.
Sometimes stressing the tree out (by topping it or girdling it) is a good way to force it to fruit, and then you can see if the fruit is worthwhile, and if not, you can stump it and graft new shoots. Avocados sometimes suffer badly from girdling, so topping the tree might be something to try first -- I've gotten a seedling avocado that was ~10 years old to fruit by topping it. (The fruit wasn't any good.)