Which of the following is a type of stage makeup?

Age makeup is a specific technique in stage makeup that transforms an actor's appearance to portray a character of a different age, such as making a young actor appear older or vice versa. This involves using various techniques, such as prosthetics, paint, and other materials to create wrinkles, sagging skin, gray hair, and other age-related features. Age makeup is essential in theatre because it helps convey the character's history, background, and storytelling elements visually, enhancing the audience's understanding of the narrative.

In contrast, props and set design makeup is not a recognized category of stage makeup; rather, it refers to the physical elements on stage that contribute to the overall set design. Scenic makeup could refer to specific designs that create imaginative or fantastical appearances, but it is less commonly categorized separately within the broader context of stage makeup. Sound design makeup, however, focuses on auditory aspects of a performance and does not involve any visual elements related to makeup. Thus, age makeup stands out as the most relevant and specific type of stage makeup in this context.