9.1: Introduction (Ob1)

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Middle adulthood (or midlife) refers to the period of the lifespan between young adulthood and old age. This period lasts from 20 to 40 years depending on how these stages, ages, and tasks are culturally defined. The most common age definition is from 40 to 65, but there can be a range of up to 10 years (ages 30‐75) on either side of these numbers. The mid‐thiries or the forties through the late 60s can be our guide. Research on this period of life is relatively new and many aspects of midlife are still being explored. This may be the least studied period of the lifespan. And this is a varied group. We can see considerable differences in individuals within this developmental stage. There is much to learn about this group. In the United States, the large Baby Boom cohort (those born between 1946 and 1964) are now midlife adults and this has led to increased interest in this developmental stage.

This is a relatively new period of life. One hundred years ago, life expectancy in the United States was about 47 years. Life‐expectancy has increased globally by about 6 years since 1990 and now stands at 68 years and ranges from 57 years in low‐income countries to 80 in high‐income countries (World Health Organization, 2011). This number reflects an increase in life expectancy in Africa due to availability of antiretroviral medications to reduce HIV/AIDS, and a decrease in Europe and in countries in the former Soviet Union. Life expectancy in the United States for those born in 2007 is now at 75.9 for white males, 80.8 for white females, 70.0 for black males, and 76.8 for black females (U.S. National Center for Health Statistics, 2010). The U. S. ranks 42nd in the world and has been declining in rank. Children born in the U. S. today may be the first generation to have a shorter life span than their parents. Much of this decline has been attributed to the increase in sedentary lifestyle and obesity. See the Washington Post article found at www.washingtonpost.com/wp‐ dyn/content/article/2007/08/12/AR2007081200113.html for more details.

Of course, longevity is not the only consideration. How long can we expect to lead healthy lives? Healthy life expectancy, or the years one can expect to live in good health, is 67 for males and 71 for females in the United States. It is higher in Japan with a healthy life expectancy of 72 for males and 78 for females. Certainly, living healthier lives is the goal. In the United States, Canada, and other countries where people live well in midlife, there are new concerns are about the aging process, the impact of lifestyle on health, productivity at work, and how to best spend the second half of life.