57. For each person the enumerator will record the exact date of birth: the year, the month, the day, written in Arabic figures -using, in all the cases two Arabic figures. So, for the months and days to the numbers between 1 to the 9, in front of each figure "0" will be written first (01,02, . . . . 09). For the year all 4 numbers will be written.

For the persons who do not remember the exact year, month and the day of birth, the enumerator will ask for identification card or the birth certificate. When none of these documents are available (for aged persons), additional questions will be asked aiming to track the birth date, or at least the year of birth (as temporal reference point as: historical and social events and the relation to the age of the person at the moment of event).