We were eight for dinner on New Year’s Eve: four men and four women with a combined age, I would guess, of around 500. A quarter of the company — two of the men — had been officially diagnosed as suffering from one form or another of dementia. We whose brains still neatly fitted the inside of our skulls were instead prey to all the usual anxieties, delusions, depressions and addictions typical of those wealthy, late middle-aged English people who exist in the strange limbo of expatriation.