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Ask for the date of birth and age of each person. This is among the most important information of the survey.
· If the respondent knows the exact date of birth of the person, write the month and year of birth. Write 01, 02, 03, … , 12 for months, and the four-digit year. Then, for question 6, calculate the person's age. Confirm this age with the respondent before writing it in question 6.
· If the respondent knows only the year of birth, write the four-digit year in column 5b and leave the month column blank.
· If the respondent does not know the date or year of birth, leave question 5 blank and ask respondent to estimate the person's age in question 6.