At the age of 40, it is still very promising to change careers as a lecturer. If you are engaged in accounting and have nearly 20 years of accounting experience, if you don't have a better development prospect at this time, but you don't want to do anything else, then you can consider becoming an accounting lecturer in a training institution at this time and gradually pass on your knowledge and work experience for more than ten years to students, so that teachers with practical experience are very popular and students can study hard. Unlike we used to study finance, teachers are all book-based and have no practical experience, and students are also rote, which are superficial. So with your experience, you will be very popular.