No such thing as outdated in the world of linguistics. Languages are forever changing, whilst some words get changed out for new ones, older words might see a resurgence. Use what words befit your fancy no matter their age, so long as they are from the language you are using.
As I am Swedish "vort" and "vore" sounds perfectly fine seeing as, in Swedish, we say "vårt/våran" and "våra".
If you use "vort" and danish people think you sound old-fashioned, do not be ashamed. Be proud, for your linguistic knowledge is not limited to only that of modern Danish.
Old words can be rather charming.
I, who for example work with leather in my spare time, am by some called an amateur leather worker. However, I would find it absolutely adoring if people called me an amateur codder instead (early 16th century term for a leather worker).
Basically, what I'm saying is, it's up to each and one of us to decide which words we wish to use. Sorry for trailing off XD