My child turned 17 in March of 2024. Is this why I am not getting the child tax credit?

[DoninGA]

The child has to under the age of 17 as of 12/31/2024.

[MindyB]

Yes. Per What is the Child Tax Credit?, the child must be under age 17 at the end of the tax year to qualify for the Child Tax Credit. 

However, the child may qualify for the $500 credit for other dependents, as long as they meet all the requirements of a dependent. Here is some more detailed information: Rules for Claiming Dependents on Taxes