Geriatric Nursing- Can an LPN specialize

Just recently graduated and passed my NCLEX (about 2 hours old) wanting to go back to school this January to continue my education. I was wondering if anyone knew any information regarding an LPN specializing in geriatrics. Do you have to become an RN first? Or is there just one class? Any info/links would be appreciated! I'm from ky...I tried to research this myself...but I have gotten nowhere!!

Also, I only need a few more classes to have my Associates in Applied Science...is this a waste of time??