I think it's wonderful that you have made up your mind and heart to enter nursing school! I took the same road you did. I worked in marketing for many years, until downsizing took me to an endless jobless search. I wanted to go to nursing school straight away from high school, dare I say, in 86, and watched as my oldest sister was treated like a , "cupcake" by Dr's and administration.(she graduated in 77) WOW have things changed! Nursing is now a profession that commands respect and is still dominated by women like my oldest sister, (now 50), who worked their tails off to exact changes in the profession for all of us now who enter it with the same calling she did.
Did I mention my sister, at it for 30 years now, still works full time, and still loves her work?! We can grow with this field, we can grow in knowledge and age and still find something in it that gives us fulfillment.
I am almost finished with my certificate program and as I near the end. (I am an LPN now.. yes, I still say LPN), the powers that be where I work, (a medi-center), dangle money in front of me to stay, offer me more time and ask me to stay. When I mention that if they can meet what I expect, I will stay, they default to my age. (40). It is flattering in a sense, and also mean spirited, but it's all good! 40 is the new 20 Studentat40! Keep your ambition and you won't be sorry!