By Christopher Jackson With the release of Wild Gods, Nick Cave is surpassing even Dylan and Cohen, entering some new circle of higher life all his own, writes Chris Jackson It used to seem to me that rock and roll was a young man’s game, possessing within it the iron law of inevitable decline. It went like this. After the euphoria of one’s ‘breakthrough’ there would be a period of ‘maturity’, usually conducted in one’s late 20s (a point in life when nobody can really be said to be mature). Around this point, various complications would arise as part of the rock star’s grim pact with the genre…