You’re going to age anyway. Why not do what you want?
If you can make it in, I say go for it.
If not, you’ll have already achieved the prerequisites to apply for another health profession (nursing, PA, etc).
Besides, you don’t have to wait the full 10-14 years to begin getting paid. True, you might not see the full extent of your salary until later, however, if I’m correct, you will still get paid while doing your internship and residency.
More so, you’ll have a great chance of having a great profession in which you can work independently and long term.
The only obstacle that I see is that you said you have many children. You need to have a very concrete plan of how you are going to raise them during your years of study, which can be very time consuming. My aunt studied law when her kids were in high school, and I don’t think she has one ounce of regret. They were older, though, and able to care for themselves. I think you should speak with other women with children who went to medical school. They can give you a better picture of what to expect and how it can be done.