Looking back on the 1960s during the 40th anniversary year of 1968, I said that the 60s didn't begin 'until some way into that decade as measured by the mere calendar', and that the early 60s still felt to me like the 50s. Reading Julian Barnes's The Sense of an Ending, I am happy to find corroboration for this view:
If you'll excuse a brief history lesson: most people didn't experience 'the Sixties' until the Seventies. Which meant, logically, that most people in the Sixties were still experiencing the Fifties - or, in my case, bits of both decades side by side.
P.S. Deserving winner of the Booker, by the way - containing much wisdom, as well as being most absorbing plot-wise.