I also have a late birthday I'm 16 and currently enrolled in a CNA course. I think our state has changed their regulations, as you used to have to be 17 to take your state boards. I haven't run into any problems yet though with my course and there are high school juniors in the class as well as seniors. Nursing homes, at least in my state, are low on CNAs and they are willing to work with schooling and other problems. I wish you luck :)