After teaching now for three years, which I know isn't a lot compared to some of you guys but I am beginning to realise that you need a good mix of children and adults or else you will start to me more and more stuck in a rut.
I have met a few teachers now in Korea who have been teaching kids for 8 or 10 years and they tell me that can never teach adults because no school would hire them since they were only teaching kids all the time. Don't get me wrong, it's great if you want to teach kids all the time but what happens if you realise that you want to teach another age group? I think if at all possible try and teach as many different age groups as you can. I am currently teaching kids, elementary and middle school and company classes. It's great to have a mix so that you can get experience in as many different areas as possible.
It's easy for me to teach kids nowadays but do I still want to be doing that when I am 40 or 50? No thanks