Which function computes the age in years based on a creation date and current date?

The function that accurately computes the age in years based on a creation date and the current date is designed to evaluate the difference between these two date values. In this case, the function responsible for this calculation is specifically named "date_years_difference." This function takes two inputs: the creation date and the current date, and returns the difference in years.

The other options do not serve the function of calculating age. For instance, "count_substring" is utilized to count occurrences of a specific substring within a string, which is unrelated to date calculations. "datetime_now" typically retrieves the current date and time but does not perform any computations between two date values. Similarly, "to_timestamp" is a function used to convert strings or other date-related data into a timestamp format but does not calculate age. Thus, "date_years_difference" is the appropriate choice for computing the age in years based on provided dates.