You are 40 years old if you were born on December 15, 1983.
You are 40 years 4 months, 3 weeks, and 2 days old or 485 months old or 2,107 weeks old or 14,755 days old or 354,120 hours old or 21,247,200 minutes old or 1,274,832,000 seconds old You were born on a Thursday.