This tag is to be used if the appearance of the protagonist ONLY is different from their actual age. This tag can be used to describe the protagonist of a cultivation novel who doesn't age despite being very old, though it is not recommended as it can become a very generic tag. Best to use this tag only if the fact that the appearance is different from actual age is actually used in the story.

Please note that the age mentioned is physical age, and NOT mental age. That might come under the Mature Protagonist tag.
The Revered Master, Yu Yan, known as the number one in the cultivation world, waited for sixteen thousand years, and finally took in a disciple. He taught her carefully, and took care of her diligently. He watched her as she slowly grew stronger as she comprehended the laws, and just as she was about to soar into prominence… she died! Hence, he once again took in another disciple, carefully taught her, diligently took care of her, and then… she died again! Thus, he took in another disciple, and not long after… she still died! Yu Yan: … Disciple: … (Why do I always get picked up by the same person every time I reincarnate? Haaaa…)