Can my wisdom tooth grow at 26 years old ?

Possibly, although: The usual age range is 16-25. Removal is controversial, especially when these 3rd molars erupt normally, are not decayed, & there's space for them to come in. Traditionally, however, it is recommended they be extracted to prevent problems later (which may/may not occur). In japan they are trying to use them to replace other lost molars.

Wisdom teeth: I have seen wisdom teeth erupt at ages 17 through 70 ! a dental x-ray will tell if they are present and if the are ok or will need extractions.