Does it really need to be Aussie kids? As Aussies would normally say, "G'day mate!" when we bump into someone on the street... but I don't think kids would normally say that... they would just be saying, "Hi, how are you doing?" 定係，你想問其他嘢？
@hmily300 Yep, all good. In saying that though, "G'day mate" would be a bit full on for most kids. Unless they are kids from a country town or something, usually kids here in Australia don't have such a thick Aussie accent.
Kids would just say their names out right in Australia, like my sons are calling my mate at my age "David", just like I call him "Dave". Unless they see my sister and they would say, "Auntie Bessie". This only applies in Australia though, some countries have a higher level of hierarchy, like in UK and US.
"... how about other countries with English as their official language" would sound more natural. It all depends on which country you are talking about. Although English applies to many countries, cultural/hierarchy differences would result in different English vocabulary, terms, expressions, slang and so forth.
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