You are 40 years old if you were born on January 9, 1984.
You are 40 years 3 months, 2 weeks, and 2 days old or 483 months old or 2,102 weeks old or 14,717 days old or 353,208 hours old or 21,192,480 minutes old or 1,271,548,800 seconds old You were born on a Monday.