What can be the age of a tree with stem of 8 mm bit les then 1 cm thick. Height can be varied because of good climate but I don't know about stems and nodes.
Any idea ?
Post a photo and we will give you a guess, but that's all it will be. Where did you buy it? Did it come with a nursery tag? If it did, contact the nursery and they can probably tell you what age trees they sell to that retailer.