However, there are increased risks for younger patients. If crooked teeth are being corrected, then removal of tooth structure will be required. If the preps need to be aggressive, there is an increased risk that nerves will get exposed, requiring root canal therapy. Also, as we age, our bone and gums develop. If the edge of the porcelain becomes exposed, then they may be less appealing and replacement would be needed.
The list of issues could go on, so the rule of thumb I use is 16 would be the youngest if teeth need to be prepped, and all young patients should know that the case likely will need to be redone once or twice in their lifetime.
With adequate informed consent, timing of treatment is a personal choice.