They shouldn't be asking about college. Their age should be locked in. Read the operational manual at
http://www.cic.gc.ca/english/resources/manuals/op/op02-eng.pdf and especially page 18 where it says:
Dependent children under 22 years of age
• Is under 22 years of age and not a spouse or common-law partner
when the application is received by CPC-M; and
• without taking into account their age, they continue not to be
married or not involved in a common-law relationship at visa
issuance and when they enter Canada.
Also look at pages 15 and 16 where it says:
5.13. Who qualifies as a dependent child?
R2 and Section 6 in this chapter describe who qualifies as a dependent child.
In order to meet R2(b)(i) of the definition of “dependent child”, a child must be under 22 years of age and not a spouse or common-law partner on the date when the IMM 1344AE is received by CPC-M, and not a spouse or common-law partner when the visa is issued, and when they arrive in Canada.
Not a spouse or common-law partner means that the dependent child must not be married or
involved in a common-law relationship. A dependent child who is single, divorced, widowed, or whose marriage has been annulled is not a spouse. Similarly, if the dependent child was involved in a common-law relationship but that relationship no longer exists, they may be considered to meet the definition.
R2(b)(ii) & (iii) describe children over the age of 22 who may be considered dependent children if they are substantially dependent on their parents for financial support. This includes full-time students enrolled in accredited post secondary institutions or children with a physical or mental condition. In such cases, officers must ask for documentary evidence of full time attendance at school, evidence of the institution's accreditation with the relevant authority, evidence of the physical or mental condition and evidence of financial dependency on parents.
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