What kind of variable is Age in the provided DATA step?

The variable Age is classified as a numeric variable. In SAS, numeric variables are used to store numbers and can be involved in mathematical computations, which is particularly relevant in the case of age since it typically represents a quantity that can be manipulated arithmetically (e.g., calculating average age or age differences).

Character variables, on the other hand, are used to store text data and are not suitable for numeric representations. While age could be categorized in various ways for analysis, such as being ordinal when discussing age groups, in a straightforward DATA step, it is most commonly treated and stored as a numeric variable. Consequently, label it as a numeric variable allows for mathematical operations and statistical analyses that can be performed on it effectively.