United States Federal Census records become available 72 years after the date they were taken. I remember in April 2002, visiting the National Archives in Waltham, MA to look at the 1930 census on microfilm for family members. (I still didn't find my five-year-old dad until these records were digitized.) January 1992 would have been when the 1920 census was released because the 1920 census was taken as of January 1, 1920. I had only just started researching census records at that time (on microfilm, at the National Archives.)
April 2, 2012 is the magic date for the 1940 US Census to become public!
Just think of all the people you know who you'll be able to find!
I'll be looking for my five-year-old mother and her family, my fifteen-year-old dad and his family, as well as my parents-in-law and their families!
Guess what I'll be doing on the morning of April 2 ... visiting the official site of the 1940 US Census!