My daughter turned 24 in July of 2018 and meets all the other eligibility requirements. Am I still able to claim her as a dependent?

[JohnW15]

If your daughter fulfills all of the eligibility requirements (see FAQ below), she'll qualify as your dependent.  If she isn't totally and permanently disabled, she'd have to qualify as a "Qualifying relative."

When you input her information into your return in TurboTax, you'll be asked to answer a series of questions, and the program will be able to determine whether she qualifies or not.

For the requirements, please see the TurboTax FAQ "Who can I claim as my dependent?" below.  In this FAQ, bear in mind that, even when your daughter doesn't qualify as a "Qualifying child," she might be eligible as a "Qualifying relative."

https://ttlc.intuit.com/replies/5187060