Am I to old to teach exercise?

I am 47 years young and just now getting into exercising I have my zumba certification, and studying for the NCCPT Group Exercise certification. I am a little afraid of taking the test thinking I may not pass however I study and read on a daily basis. It is a struggle because I am also working on my Master in education. Another instructor suggested I wait til I graduate then study my group exercise certification. I find myself paying for all type of exercise courses, I have taken the lifttime academy course, some AFAA courses and now the nccpt. Does it seem as if I am all over the place, i feel that if i take these courses it will help me with the test. I just started at 47 years old and I am wonders if i should proceed, I teach praise dance and desire to learm more about corrective exercise, I have also taught a few zumba classes. I have my own studio to teach zumba but have not did it because I want a certification bad. Any suggestion please advise?