I don't mind answering questions that help provide data needed to accurately enumerate the population. I do question why they need to know my name and date of birth. They already asked my age on the form, and I'm not sure why they need my name?

For those interested in the wording in the Constitution:
Constitution's census clause (Art. 1, Sec. 2, Clause 3) is not limited to a headcount of the population and "does not prohibit the gathering of other statistics, if 'necessary and proper,' for the intelligent exercise of other powers enumerated in the constitution, and in such case there could be no objection to acquiring this information through the same machinery by which the population is enumerated."