Actually, he's not in his 70s, he be 70 in August. He looks like he's in his 80s though which is a concern. He does appear to have shrunk which can be attributed to age or postural issues/back problems.
The way he hold his guitar now is different and kind of awkward looking and I'm guessing this is perhaps to save pain on his back. I suffer from frozen shoulder and postural problems myself and can understand this. The new angle may alleviate some of the weight across the top of his neck. I do this when carrying things around my neck for long periods such as my camera.
I agree wholeheartedly dmg, unfortunately MK does look like he's 'Old before his time' as my late Grandfather would have said.
He does certainly look a lot older than 69........
He is rooted to the spot with hardly any movement around the stage and when he does move he shuffles...
I do find it incredibly sad to see him like it and only hope he does make the whole tour......
Again like qjamesfloyd has quite rightly put on here that we all have our own unique memories of MK and how special 'the master' is to each one of us... I shall never, ever forget meeting him, chatting and shaking his hand.......
Blimey it sounds like an obituary, but in some little way seeing him the way we have on stage the fire is slowly dying.