If age is calculated using the formula Age=(GradDate - DOB) / 365.25, which function is best for reporting age in whole years?

The best function for reporting age in whole years from the given formula is the INT function. The formula calculates age in years as a decimal, which includes both the whole number of years and any fractional part that arises from the division by 365.25.

Using the INT function effectively truncates the decimal, returning only the integer portion of the age calculation. For example, if the calculated age is 25.7, the INT function would return 25, representing the age in complete years without rounding up or including the fraction of the year.

Other functions mentioned would not serve the same purpose effectively. For example, ROUND would round the result to a specified number of decimal places and may return 26 if the age is 25.7. DAY is designed to extract the day part from a date rather than work with age in years, and YEAR would similarly operate on date values, not providing a straightforward way to capture age in whole years based on the formula. Thus, using INT is the most appropriate choice for accurately reporting age as whole years.