I used medictests.com and it seemed to be very helpful. It keeps track of what you need to study and what your average is in each category.
I'm sure others have used different ones but I would suggest going back through your books and make sure you absolutely know the material before going...
Just finished school and waiting on the state to finish the file review so I can test. I am 42 and don't feel I'm to old at all. My intentions are to continue my education in August by attending paramedic classes. One student in emt class was 56 and excited to be going through the program.
So...
Took the EMT test today at 11:45est and got the results by 3:00est which I think was outstanding. 120 questions and I passed. I kept hearing that if the test went to 120 it's likely you failed well not so in my case.