Enter each person's age in completed years, that is, his/her age at his/her last birthday. Completed age is also defined as 'the number of completed solar years since birth'. With this definition, since a 6-month-old baby has not completed a full solar year, his/her age will be entered as '00'. Note that you will be obtaining more accurate estimates of children's ages later. This column should never be left blank. If you have difficulty obtaining the ages of very elderly members of the household, you may enter the code '98', meaning 'Doesn't know/over age 50'. For household members younger than 50, completed ages must be entered.
Question post text
Record in completed years 98=DK* * See instructions: to be used only for elderly household members (code meaning "do not know/over age 50").