You are 40 years old if you were born on January 31, 1984.
You are 40 years 2 months, 3 weeks, and 3 days old or 483 months old or 2,099 weeks old or 14,694 days old or 352,656 hours old or 21,159,360 minutes old or 1,269,561,600 seconds old You were born on a Tuesday.