It's been nearly four decades since Alex Trebek became a household name as the host of "Jeopardy!" The 79-year-old has been candid with fans about his current battle with stage 4 pancreatic cancer and it turns out the life-changing diagnosis has inspired him to put his thoughts onto paper for the first time ever with an upcoming memoir. "For over three decades, Trebek had resisted countless appeals to write a book about his life.