McCain and Ming and the age thing..

I am sure that this will have been written about and I've missed it but what is the explanation for the trashing of Menzies Campbell(aged 66) and the lionisation of John McCain (aged 71) on the basis of their age?

Is the demographic profile of the US and UK so different? Are the US media just biding their time before turning on McCain? Is there genuinely a more mature(!)attitude to ageing in the US?

And doesn't it appear that in the UK that far from becoming more enlightened about the role of older people in public life etc, attitudes are actually moving the other way?

Jonathan(aged 53)