I have been in the same line of work for over 33 yrs. I did not intend the metals/steel business be my lifes' work- It just sort of happened. I was working in Product Design for a year after college, when a week before I was to be married-our project was cancelled and I was let go. When you are young, these kind of things bother you! I interviewed at three places, taking the easiest job because my self-esteem was a little missing, and my new wife-to-be didn't have a job yet either! After a couple of months, I noticed technically advanced people were not in abundance in this industry, so I stuck around to see if that might be an opportunity. It was.
My father was a salesman most of his career. I remember as a little kid him coming home frustrated and sometimes a little "wound up" from trying to get people to buy something, only to have them choose other options. That is why I decided on engineering! Your gene pool has alot to do with how you turn out, as my technical training and natural gift of gab made me a perfect candidate for the job I've had for 30yrs.!
However, after a long time in the same field-especially when it is not in growth mode, you ask; wouldn't it be cool to try something else? It's your career-but are you happy? Life is an unknown. Maybe we all ought to make sure we are living it the way we want.