I agree with your Aunt. This might not be a popular opinion but here goes. I have been a nurse for 17+ years. I now work in home care and love it, however; After all this time I still only make 55k/year. And more often than not through the years I have had jobs that I absolutely hated. In fact most positions I have held up until now have pretty much s*cked. In the hospital, private duty, ltc, subacute, (hated them all). I am now pushing 40 and wish that I had had the motivation and self discipline to go to med school when I was younger. I am thinking about an NP but now with family commitments and work it will be much harder to do. There is a saying, and I am paraphrasing, most people have regrets not about what they did but what they did not do.
I say go for it if you really want to. :)