You are 45 years old if you were born on December 9, 1978.
You are 45 years 4 months, 1 week, and 1 day old or 544 months old or 2,366 weeks old or 16,566 days old or 397,584 hours old or 23,855,040 minutes old or 1,431,302,400 seconds old You were born on a Saturday.