Final answer:
To qualify for the child tax credit, the child must be a dependent and be under age 17 at the end of the year.
Step-by-step explanation:
In order to qualify for the child tax credit, the child must meet the requirements to be a dependent and be under age 17 at the end of the year.
The child must be claimed as a dependent on the taxpayer's federal tax return in order for the taxpayer to be eligible for the child tax credit.