Kim, has anyone ever told you that admissions officers do not really believe that a child at the age of 7 can have decided upon a permanent career path that will follow him to adulthood? Well, that is true, they think that when an applicant uses an age lower than 13, which is high school age, the student is trying to simply make an impression on the reviewer. Since you are not declaring yourself a child prodigy in this instance, it would be best to omit the age reference in the essay. Just say that you were impressed by the medical care your cousin received and you decided that you would want to follow in the footsteps of those who took care of him while he was sick. Do not make any reference to any particular field of patient care so that you can create the impression that being an AA is the career you eventually settled on due to your shadowing of this person.
Remove the references to your failure in school. Retain the reference that you tried to enroll in the Pharmacy program before but failed. That will show that you have a continuously evolving interest in the medical field. Remember, the personal statement has to show that you have a continuing interest in the field of study that you have chosen. So you have to indicate how you evolved in your interest from Pharmacy to AA. Create the connection in order to explain the development of your interest in a clearer manner. Right now, the change is too abrupt and doesn't make sense. Additionally, it would be best if you can indicate what related activities you were involved in previously that led you to the choice of AA as a career.