Expert behind survey on middle-age misery says it’s better to be outdoors with friends – and to throw away the self-help booksFeeling on the verge of a midlife crisis? The key to a happier you can be simple: switch off your mobile now and again, listen to music, head outdoors, or spend some time with friends.Last week, a survey concluded that we are at our most miserable between the ages of 50 and 54 and that happiness doesn’t come round again until you’re aged 65-79.