There's no way to be sure from the limited information you have. 4ft is relative to the locality. For example, if it is a Colombian, it may only be 1 1/2 - 2 yrs old. But if it is one of the mexican localities, it could very well be fully mature and be well over 10 yrs of age.
Pictures might help. If you can post a few, we can try to give you a better estimate.
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