What are Canada’s requirements for the accompanying children of new immigrants?

According to Canada’s latest immigration policy, which will be implemented on August 1, 2014, the age limit for accompanying children is: unmarried children under 19 years old (including 19 years old) or those over 19 years old due to physical reasons and mental reasons, they are dependent on financial support from their parents (mainly refers to students or children with mental or physical abnormalities)