Obviously they do not have any laws against it over there, you would never see an advertisement in Australia like that.
However, although it excludes me IF I was looking at the job, at least it is honest and you know where you stand? In Australia, as in most other Countries, you would go ahead and apply and then either get nowhere when they read your details, or saw your age at the interview?
Which is worse, maybe it is better for them to be honest up front??????
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"I USED to be a PPRuNaholic, but now I'm CURED"