D. Sex "M" or "F" and age in years at last birthday and completed months since then (See Note 3).
Sex: _
Years ____
Months ____
3. Age (Column D)
(a) If the age is not known exactly, give it as accurately as possible.
(b) Even where the birthday is only a few days after Census day, the required age is the number of years at the last birthday and 11 months.
(c) For babies under one month old, write "Under I month".