Mid Career Crisis?

As teachers, we keep getting 21st century teaching techniques crammed down our throats. One of my favorite statistics mentioned many times over, is the one that our students will have an average of five different career fields in their lifetimes. It is not just jobs within a field say, such as medical or automotive; it is actually five different career fields. Then of course they compare this to our parents or grandparents who usually only had one or two different careers, usually within a certain field. What I'm beginning to notice is that is that those who are currently working are left out of this story. 

What about us? Will I be like those who are only 20 years my younger and have five different careers, even though I have spent 12 years in my first one? Or will it be that of one or two or maybe even three since that may be in the middle of the two age sub groups? I can't imagine being a teacher and only a teacher my whole life. Hard to even imagine having only two career fields. Does anyone else want to have this variable career paths theory involved in their one and only life? Will I be happy? Will you be happy?