By MILLIE MUROI, Economics WriterIf I told you someone, especially a politician, wasn’t acting their age, you might safely assume that’s a bad thing. What childish behaviour have they indulged in this time, you might ask.But this week, it’s a compliment. The fountain of youth still evades us, and there’s no great anti-ageing commission – AAC, not to be confused with the ACCC – on the way. But the focus in Canberra has switched,...