You are 20 years old if you were born on January 31, 2004.
You are 20 years 2 months, 3 weeks, and 5 days old or 243 months old or 1,055 weeks old or 7,391 days old or 177,384 hours old or 10,643,040 minutes old or 638,582,400 seconds old You were born on a Saturday.