Clinical Nutrition in Gastrointestinal Disease

Alan Buchman, MD, MSPH

Chapter 14: Nutrition In The Elderly (continued)

Lisa M. Neff, MD; Joel B. Mason, MD

In the early years of the 20th century, the life expectancy of a newborn American infant was just 49 years. However, as a result of improved nutrition, sanitation, and medical care in the last century, humans now survive nearly 80 years on average.1 In 1900, only 4% of the American population lived to 65 years of age.2 By the year 2000, this number increased to over 12%.3 It has been estimated that by the year 2030, 71 million or nearly 1 in 5 will reach the age of 65 years, and 19.5 million will live to see their 80th birthdays.3 Figure