You are 24 years old if you were born on December 9, 1999.
You are 24 years 4 months, 1 week, and 3 days old or 292 months old or 1,271 weeks old or 8,898 days old or 213,552 hours old or 12,813,120 minutes old or 768,787,200 seconds old You were born on a Thursday.