You are never too old I wish I had started back in my early 30's. I worked with a lady who just retired, for the 2nd time, from nursing. I hope to retire once. LOL! I finally finished nursing school at early 40's. Make sure you know what area of nursing you would like to focus. Medsurg is a good place to start but it is physically draining but you still have lots of energy. I say if you have the time shadow a nurse. One the other hand, nursing has lots of options I wish I had known that 25 yrs ago. Do your research... Good luck! I hope this helps.