When the actor/actress who is cast to play a character is actually too young to be that character
Do We Have This One and Needs A Better Name You know how sometimes you're watching a show and you think, "Hey, isn't that person too young to be a doctor?" This is an example of under-aged casting, and it happens when an actor or actress is not actually old enough to be their character, for instance, when a twenty-three-year-old actor plays a character with a Ph D. This happens most frequently to characters who are doctors, lawyers, or some other profession that requires a lot of schooling, and actresses tend to be cast in older roles more often than actors. This can cause Playing Gertrude if the character has a teenage or adult child. However, it can also result from Playing Gertrude if the actor or actress portraying the parent is physically too young to have bore the child in question (i.e. a character played by a forty-year-old actress having a thirty-year-old daughter). This trope is subverted when the character has actually skipped grades in Canon. It is not simply the opposite of Dawson Casting, because it doesn't only require that the actor is younger than the character. The actor must be too young to be the character.