You are 49 years old if you were born on December 30, 1974.
You are 49 years 2 months, 4 weeks, and 1 day old or 591 months old or 2,569 weeks old or 17,987 days old or 431,688 hours old or 25,901,280 minutes old or 1,554,076,800 seconds old You were born on a Monday.