This function checks whether an age is valid (numeric and between 8 and 12). CAPL-2 scores and interpretations are valid for children between the ages of 8 and 12 years.
A numeric vector.
x contains a decimal value that is otherwise valid (e.g., 8.5, 10.1), this function will return the
floor() of the value.
capl functions called by this function include:
Returns a numeric (integer) vector with a value between 8 and 12 (if valid) or NA (if not valid).
validate_age(c(7:13, "", NA, "12", 8.5)) #  NA 8 9 10 11 12 NA NA NA 12 8
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