Is it too late to go back to school; and if not, do I have to start all over again?

The extent of my formal education is a BA degree that I received 14 years ago. I’m exploring the idea of going back to school, but I would like a technical degree (science or engineering).

I assume that I wouldn’t be able to begin a Masters program without first getting a BS in the same or a closely related major.

So, is my first step to get a BS? If so, should I expect to take all the non-major-related classes (English, History, etc.) or would those requirements typically be able to be transferred from my Bachelors?

I understand that each college or university would have it’s own policies, but if anyone has insight on what to generally expect in this situation, it would be helpful in my decision making-process.

After finding this fluther post, I added the “is it too late” part because hypothetically, by the time I finish school, my age will prevent me from being hired (I’m 37 now). Also, there was good advice in the replies about doing something you’re passionate about.