Animators often give their heroes superlative physical powers just because they can. Mr Fredricksen, the grumpy septuagenarian at the centre of Up, has by contrast a hearing aid, false teeth, a walker and a stairlift that's on the blink. It's a struggle for him to heave himself out of his armchair. He could betoken a bold break with movie stereotypes or simply be a sign that Hollywood, so long obsessed with the youth demographic, is finally wising up to the power of the grey dollar.