There's an eerie feel to the carnival setting at Sydney's Luna Park. The usual laughter of kids running from dodgems to candy stalls has been replaced by the stylish steps of advertising execs sauntering from event to event. There's something post-apocalyptic about it – as if we've been transported into a future where children are no longer necessary because humanity has found the cure for ageing.

A PR minder walks me past the deserted rides to the far side of the venue, where we enter a vast room filled with pinball machines and an assortment of carny games. We're joined

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