OP
As a 32 year old nurse who is starting medicine in September I encourage you to follow your dream! Yes nursing is an option to you, but the two careers are completely different and should not be gone into as a substitute for the other. Try and get some experience with both medics and nursing if you seriously are considering either. It is important that you have an accurate idea of what you are getting yourself into!
Nursing isn't as easy to get in as you might think, purely because of the number of applicants etc. However currently it remains a funded course and wont cost you anything, and you will even get a bursary to live off. There are a lot of mature students with families on the course, and yes it can be seen as family friendly. But you still have to do your fair share of nights, weekends and starting shifts at 7am. Most courses are 45 weeks per year, with half the time spent on placement doing 37.5 hour weeks. Once you graduate starting salary is approx £21000 but at the moment there are major job shortages and I know of many NQ nurses without jobs as the trusts make their savings by not replacing nurses.
As for medicine, I know what its like to have that as a constant need in your life. I kept coming back to it too! Age doesn't phase me as much, I will be 38 when I start FY1, so 25 years to work as a doctor, well worth the money I will pay to go back to uni! Contact the uni's admissions directly and ask their advice, be it access course or A levels.
I have to agree with the other posters about only limiting yourself to one uni. I made that mistake last year, only applied to Glasgow and then missed the UKCAT so was a wasted application. I applied to 4 unis this year and am now having to move to the other side of the country. Its going to be difficult, but I will commute at the weekends to work and see my family to start with anyway. I had to accept that if medicine is something I really had to do, then I couldnt limit myself to one place. Plus as everyone else says, as FY1 on you have to be prepared to move anywhere. So think of this as a practice! Although you actually are earning by then, and not living off loans..
Anyway, good luck. Follow your dream, give it your best shot, and where there is a will, there is a way!