Can a zimbabwean join Australian army?

Yes. A new law has passed which will allow women into combat role (something which was banned before)

If you are an Australian citizen, or dual citizen with Australian citizenship, yes. Australia does not accept foreign volunteers, even from Commonwealth nations.

If what?

Well not just anyone can join the Australian army. You have to be at least 16 and pass the physical and blood test for start and there are a few other things but that's all I know.

You have to be 17 and a half and compleated atleast year 10 of school