Yes, you are right. Once you are over 40 private schools think they don't want you anymore, even if you are better teacher kids than some 25 year old just out of college. There are just some assumptions there. Universities, on the other hand, prefer someone older than their students. However, you have the large classes, and have to teach Oral English as if it's a lecture course. It's ideal for older people who are academicians but have no idea how to teach speaking, because they won't know when they are doing it wrong.