I can't help you with the access course, as my uni were happy to accept me straight onto the Radiotherapy course as I have a degree in Chemistry - albeit 25 years ago! Although I have spent the intervening period working in a scientific/technical job role.
Regarding age - I'm 47 now, will be 50 when I graduate. God willing I've got a good 10-15 working years left in me, and I intend to spend it doing something that makes a difference in peoples lives. I "wasted" 15 years wanting to do something more with my life before I was forced into a "now or never" situation. Don't spend the rest of your life thinking "if only..."
Go for it, and good luck!