sarahwoodbury.com/life-expectancy-in-the-middle-ages Sarah Woodbury 1,000 years ago sarahwoodbury.com/life-expectancy-in-the-middle-ages Sarah Woodbury sarahwoodbury.com/life-expectancy-in-the-middle-ages adult royal family of Wales and associated Marcher relations only 48 years Sarah Woodbury adult royal family of Wales and associated Marcher relations Sarah Woodbury