Convert the following birth years to ages as of 2025 and then compute the ratio of the oldest to the youngest: birth years 1975, 1995, 2010. Show calculations and explain why the ratio is meaningful after conversion.

• A. Ages 50, 30, 15; ratio oldest/youngest ≈ 3.33; meaningful because ages are ratio-level after conversion.
• B. Ages 50, 30, 15; ratio ≈ 3.33 but ratios remain meaningless because birth years determine differences but never support multiplicative statements about persons.
• C. Ages 50, 30, 15; ratio oldest/youngest = 50 − 15 = 35 and multiplicative interpretations are discouraged because age differences are the only legitimate metric.
• D. Ages 50, 30, 15; ratio = 1500 if you multiply ages rather than divide which is the correct multiplicative interpretation for age comparisons.

Answer: (A)