You are 39 years old if you were born on December 18, 1984.
You are 39 years 4 months, 1 week, and 1 day old or 472 months old or 2,053 weeks old or 14,374 days old or 344,976 hours old or 20,698,560 minutes old or 1,241,913,600 seconds old You were born on a Tuesday.