If the teeth are fully erupted, and the patient's bite meets criteria for predictable treatment with Invisalign, then it may be a good option. Two main concerns we look at with teens are:
1) Will they be compliant wearing the aligners as instructed (ie. 22 hours per day - no exceptions)? This is something to seriously consider and discuss with your child. Also consider his/her level of responsibilty in other areas of his/her life. Is the bedroom kept uncluttered? Do they do chores without being asked? If you are confident that it is a good consideration. If you are not confident, you may be dissapointed in the result and the feeling of a wasted expense that results.
2) The eruption of the the teeth, especially the second molars may not be complete at this age.
Invisalign has done a good job at making adjustments and concessions for these concerns. In short, they have customized the manufacturing process just for teen cases. So if you are comfortable with what I have discussed than feel free to visit an orthodontist about your concerns.
Good luck,
Dr. D