I've never started a job thinking "I'm going to work here for X years, and then quit (for Y reason)". I've also never started a job expecting to work there for the rest of my career, although I would be happy if it was a good job and I did.

I might end up quitting my current job after a year or two, I might be here 10 years, maybe I'll leave in a casket. I don't have a set date for when I'll quit.

My father has had the same job for over 40 years. He's had different roles (originally a telecommunications rigger, now a network engineer) and worked for different companies (buyouts etc.), but he's never actually had to apply for a new job. He's enjoyed his work and had a good career.

I guess there's not many jobs like that these days though.