Photo: Chase Brice sacked as he fumbled. By TOM SHANAHAN When Duke coach David Cutcliffe retires and writes his book on his football life, he needs to include a chapter for people in their mid-60s with advice on workout and diet routines to maintain energy and work ethic. Cutcliffe, who turned 66 last week, pointed his finger at himself when explaining how the Blue Devils (0-2, 0-2 ACC) took a step backward with a 26-6 loss to Boston…