Is it too late for me to be pursuing a degree in medicine?
While I don't have experience within the specifics of your question I can give general advice based on other fields I studied and work in:

1). It's never too late to go back to school. When people say "is it too late" they generally mean "will people be willing to hire me?". So I'll answer it that way. Age doesn't matter, skill set does. If you can prove that you have potential and the skills needed to do a job then employers won't see age as a big factor. If you're worried that your age to experience will be off then stop worrying. When you're fresh out of school you'll be on the same playing field as others fresh out of school. Make your resume look better than theirs as someone who employs people with degrees I never factor age into my decisions because it's a bias that doesn't effect much until the person is 50-60 (depending on the field). 

2). This is not my field so I won't answer this one, sorry but I'd like to convey information I'd stand behind. 

3). When it comes to schools and programs that's a very broad question. Look into medicine programs in certain countries so you can see how countries compare to each other and how people in that country use their degree. Once you have a country in mind you'll need to locate all schools with medicine degrees (to rule out areas without any). Keep researching and narrowing until you have 2-4 schools in mind. Each school operates differently and different countries run their education systems very differently so until you have a country in mind you shouldn't look into specific programs because then you may end up needing to look at the education system of X amount of countries, the funded programs if any, etc.