I grew it from a pit. It is about 12 feet tall, maybe 6 or 7 years old, and we live in central Florida.

After doing some research, the best answer I found was on wikepedia: While an avocado propagated by seed can bear fruit, it will take 4–6 years to do so, and the offspring is unlikely to resemble the parent cultivar in fruit quality. Thus, commercial orchards are planted using grafted trees and rootstocks. Rootstocks are propagated by seed (seedling rootstocks) and also layering (clonal rootstocks). After about a year of growing the young plants in a greenhouse, they are ready to be grafted. Terminal and lateral grafting is normally used. The scion cultivar will then grow for another 6–12 months before the tree is ready to be sold. Clonal rootstocks have been selected for specific soil and disease conditions, such as poor soil aeration or resistance to the soil-borne disease caused by Phytophthora, root rot.

I have several small trees grown from seed. We don't have any fruit. I understand the fruit won't be too good if it does grow. It's kind of like pecans. The softshell pecan has to come from a grafted tree. Otherwise, only small hard pecans are grown by the tree.

Good luck and hope this helps