We don't use old english anymore. In the modern english language we only use one space.
I think you will find that "old english" (whatever that refers to) predates typewriters.....
As the article states (and the one I posted previous) it depends on the medium used and whether it is a monospaced font etc....
Grammatically either is correct. Using Computer based media would obviously use one space, whereas using a ribbon typewriter would require two.