You are 21 years old if you were born on December 31, 2002.
You are 21 years 3 months, 3 weeks, and 4 days old or 256 months old or 1,112 weeks old or 7,786 days old or 186,864 hours old or 11,211,840 minutes old or 672,710,400 seconds old You were born on a Tuesday.