You can't be claimed as a dependent at age 24.

To meet the qualifying child test, your child must be younger than you and as of the end of the calendar year, either be younger than 19 years old or be a student and younger than 24 years old. There is no age limit on claiming your child as a dependent if the child meets the qualifying relative test.

http://www.irs.gov/Help-&-Resources/Tools-&-FAQs/FAQs-for-In...