Sweet dreams are made of this,
Who am I to disagree?
I travel the world at seventeen,
Everybody's looking for something.

The story:

I was just a young lad when this song came out, and I swore up and down she was saying she "travel the world at a-seventeeeeen...."

I was young enough not to be familiar with the term "seven seas" and old enough to know there were a hell of lot more than seven seas.