You are 40 years old if you were born on February 21, 1984.
You are 40 years 1 month, 1 week, and 1 day old or 481 months old or 2,092 weeks old or 14,647 days old or 351,528 hours old or 21,091,680 minutes old or 1,265,500,800 seconds old You were born on a Tuesday.