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Middle adulthood is a critical period of the life course. How we develop in middle age–the central period of our lives–can influence how well we cope in our later years. Middle Adulthood: A Lifespan Perspective explores these issues by bringing together a distinguished group of international contributors associated with a range of prestigious longitudinal studies.  

Genetic Influences on Midlife Functioning
Genetic influences on midlife functioning
Nancy L.PedersenErica L.SpottsKenjiKato

Regardless of the definition of “midlife,” most of the research in this area is typically normative. Behavioral genetic designs, on the other hand, focus on individual differences, on partitioning genetic and environmental sources. Our goal in this chapter is to provide a review of behavioral genetic studies of midlife, focusing, when possible, on longitudinal findings. Surprisingly little research of this nature has been explicitly devoted to the adult years (between 30 and 65 years of age), although several twin and family studies either are maturing into midlife, have included individuals in midlife because they were parents of adolescents, or have included participants under the age of 65 in studies of aging.

Behavioral Genetic Designs and ...
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