American Opportunity Tax Credit Fifth Year Senior

I found a similar answer for my question but it didn't provide enough details. I would like to ask if I would be qualified to claim my American Opportunity tax credit on my 5th year being a senior. I attended a community college from Fall 2009 - Spring 2011. Currently, I am studying at a four-year college from Fall 2011 to present (Spring 2014). I haven't finished my bachelor's degree as of the end of 2013. That being said, I am currently working on my 5th year and have completed over 120 credits. Furthermore, my parents claimed me as a dependent on their previous tax year and have taken the American Opportunity  credit twice so far (for years 2011 and 2012). I turned 24 in October and made more than $3900 in 2013, so I believe my parents can no longer claim me as a dependent. So I am concerning whether or not I am able to claim the American Opportunity credit on my tax return if I am filing as a single person who cannot be claimed as a dependent. Thanks!