And....yes you can still claim your son as a dependent. Claiming him for 2023 is based on his age at the end of 2023---not on his recent 2024 birthday. You will not get child tax credit for him--he is too old---but you get the $500 credit for other dependents.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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