LONDON  London is aging at a faster rate than any other major city in the UK, as an increasing number of residents choose to opt out of having children, according to research by the Resolution Foundation. The median age in the capital has risen by two years, reaching 35.8 in just over a decade -- a rate of change more commonly associated with rural villages. The findings contrast sharply with trends in other large UK cities, where the average age has dropped slightly by half a year to 34.5