You are 39 years old if you were born on December 31, 1984.
You are 39 years 3 months, 3 weeks, and 3 days old or 472 months old or 2,051 weeks old or 14,359 days old or 344,616 hours old or 20,676,960 minutes old or 1,240,617,600 seconds old You were born on a Monday.