Which 6 cricketers have scored a Test double century after turning 40?

Zimbabwe's Craig Ervine became the sixth cricketer to score a Test double century after turning 40, hitting an unbeaten 206 against Afghanistan in Sharjah on Monday. The others are South Africa's Eric Rowan (236) and Dudley Nourse (208), and England's Jack Hobbs (211), Patsy Hendren (205*) and Graham Gooch (210). At 41, Ervine is the third-oldest Test double-centurion in history.