Do we have old ancient torah manuscript?

http://abcnews.go.com/International/worlds-oldest-complete-torah-scroll-found-italian-professor/story?id=19280022

It is said that this so called oldest complete torah scroll is only 800 years old.

The Christians uses Septuagint that they(or we?) claim is older. I suspected that Christians uses Septuagint to fit their agenda.

However, after reading the above article, I began to suspect. Septuagint are indeed older.

So how come Jews don't have old surviving ancient scrolls like Christians?

And is that merely 800 years old scroll really the oldest?