You are 40 years old if you were born on December 9, 1983.
You are 40 years 4 months, 1 week, and 2 days old or 484 months old or 2,105 weeks old or 14,741 days old or 353,784 hours old or 21,227,040 minutes old or 1,273,622,400 seconds old You were born on a Friday.