When it is too late to start over in a new career path?

No, it is never too late to start in a different field. In fact, it is exciting and a great way to NOT spend your life doing something that is not fulfilling. My mother mother went to college to become a dietitian and worked as one in a hospital for 10 years after graduation from college. She decide to switch careers because she realized she loved the training/teaching of new dietitians more than actually being one. She went back to school at 32 to get a degree in teaching and retired from being an elementary school teacher (which she LOVED) about 10 years ago. Do what you love; that will insure your success!