Should I go to veterinary school?

I’m in a strange early mid-life crisis. I’m in my early thirties, have a steady job (which I dislike), a University degree and also went back to college a few years ago. I never liked school, therefore didn’t do very well (just didn’t care) yet I’m thinking once again, to go back.
I’ve always had an inclination to be a vet. It was something I wanted to do when I was a child, but got side-tracked and never did well in math or science. I don’t think it’s my dream to be a vet, but I am quite lost these days and it’s something that I’ve been thinking about a lot. I think I’d be really good at it and enjoy it. I love animals, and in the mean time will be volunteering at a shelter.
That being said, I know to become a vet takes a lot of hard work/schooling and is quite competitive and expensive.
For me to even get on the right course for this, I’d have to take some college/university courses in biology, chemistry and math. (My previous schooling is in the arts). Then, after I get all the required courses to even be able to apply for veterinary college I’d have about 4 more years in vet college before I’d graduate.
At that point, I’d be close to 40! Is it crazy for me to even entertain the idea of doing this? Or am I just truely lost and grasping at straws?