You are 24 years old if you were born on September 16, 1999.
You are 24 years 7 months, 1 week, and 3 days old or 295 months old or 1,284 weeks old or 8,989 days old or 215,736 hours old or 12,944,160 minutes old or 776,649,600 seconds old You were born on a Thursday.