if you are over 24 on 12/31/2021 you can't be claimed as a qualifying child (dependent).
however, someone, probably your parents can claim you as a qualifying relative (dependent) if the following tests are met.
1) you lived in their household the entire year. Absences for educational purposes are ignored
2) your gross income for 2021 must be less than $4,350
3) they provided over ½ your support
Search the web for a dependent support worksheet that you can complete.
for example, if you live at home, except whe at school, the value of the lodging provided by your parents is included in the support they provided.
