I take my yoga teacher training until I was in my forties and it's really a wonderful experience. At first, I was not even taking in order to learn. I just want to go further in learning and increase your daily meditation and peace. Many people in my class is not the same and had no intention of ever teaching. However, as the class continues, interest in learning is becoming much stronger.
Some people will specialize with children or pregnant women, or another area. Others are generalists. There are also opportunities to learn those recovering from illness or injury. Each branch of yoga will have a mild, intermediate and advance levels of instruction. You can only specialize in working with beginners, if your passion.
Most of the training program will come from a particular school. It can be a Kundalini yoga, Hatha, Bikram, Ashtanga or different tradition. If you have not taken any yoga before, try several different approaches to see which tells you the best. In every training program you, you'll get some time to practice your skills and learn the various routines. Also, these programs cover nutrition, anatomy and philosophy underlying approach will be ordered.
