Interviewer instructions
137. <span class="em">Age of person when infirmity appeared</span>. It is not necessary that the degree of infirmity should be absolute or total, but that it should be so sufficiently marked in any one of the classes as to have reached the stage of incapacity. The answers to each of these questions will be given by entering the age at which the person became incapacitated because of the infirmity. In all other cases the spaces will be left blank. If the infirmity is born with one, or dates from childhood, the entry will be made by writing the word 'child' for childhood. See Sample Schedule. Persons who are deaf but not dumb are not to be reported on this schedule.