Unsure how old but I've seen 3 years old ones and there only about 3 to 4 feet tall. I've seen pixs of cooler country and huge fast growth but here its been very slow till now. As we are having cool nights as is winter for us. Sure hopping to get Habs that big. There is a 3 foot taller one but pixs are no good so will have to take more. As from what I see harvests are not much better then that of 4 foot ones