Combine the ages your ancestor gave in different censuses to narrow down the birth date range.
Enter the age your ancestor was given in each census you've found. Leave the others blank. For a baby under one year old, enter 0.
Enter at least one age.
Each census records a person's age on the official census day, not the day the census taker visited. Ages often drift from census to census because someone else answered or the person didn't know. See Census Questions by Year and How to Read the U.S. Federal Census.