It is possible that some persons may not remember the exact date of birth but can tell you the age. Others may only know the year of birth, and so on. If the respondent gives you the date of birth record, the year, month and day in the relevant boxes at Q1.2a. Based on this information, calculate the age in completed years at September 10, and record in the space provided at Q1.2b. If the age is given for Q1.2b, there is no need to enter the date of birth at Q1.2a. Only when the respondent gives the date of birth as the first answer, (in which case you must calculate Q1.2b), will there be answers in both Q1.2a and Q1.2b. You must make every effort to obtain an estimate of age, as this question must be completed. For persons 98 years and over, record "98" and for babies younger than one year old record "00". Refer to the appendices and use the age table to guide you in calculating the age on Census day.