Dependents

Hello! The below information is for claiming the Child Tax Credit. 

For tax year 2021, a qualifying child is an individual who does not turn 18 before January 1, 2022, and who satisfies the following conditions:

1. The individual is the taxpayer’s son, daughter, stepchild, eligible foster child, brother, sister, stepbrother, stepsister, half-brother, half-sister, or a descendant of any of them (for example, a grandchild, niece, or nephew).
2. The individual does not provide more than one-half of his or her own support during 2021.
3. The individual lives with the taxpayer for more than one-half of tax year 2021. For exceptions to this requirement, see IRS Publication 972, Child Tax Credit and Credit for Other Dependents PDF.
4. The individual is properly claimed as the taxpayer’s dependent. For more information about how to properly claim an individual as a dependent, see IRS Publication 501, Dependents, Standard Deduction, and Filing Information. PDF
5. The individual does not file a joint return with the individual’s spouse for tax year 2021 or files it only to claim a refund of withheld income tax or estimated tax paid.
6. The individual was a U.S. citizen, U.S. national, or U.S. resident alien. For more information on this condition, see IRS Publication 519, U.S. Tax Guide for Aliens. PDF

I do not fully understand the question.

I have assumed that you want to understand if your dependent would be a qualifying child for  purposes of the Advanced Child Tax Credit.

For the purposes of the Advanced Child Tax credit, a qualifying child is an individual who does not turn 18 before January 1, 2022. Based on the information you provided, your dependent would not qualify you for the Advanced Child Tax Credit in 2021.

your question is incomplete. why what? 

For a 2020 return you can claim a child as a dependent until they turn 19  OR  up to 24 if they are a full time student.   They are only eligible for the Other tax credit of $500 and not the CTC of $2000.