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 Seattle Longitudinal Study

Welcome to the new Website for the Seattle Longitudinal Study! 

The Seattle Longitudinal Study (SLS) begun in 1956, is considered to be one of the most extensive psychological research stu​dies of how adults develop and change through adulthood. The SLS is unique as a cohort-sequential longitudinal study, examining cognitive and psychosocial change in multiple birth cohorts over​ the same chronological age span. SLS participants represent a stratified random sample of enrollees in the Group Health Cooperative, a large HMO in Washington state. Over 6,000 adults from age 22 to 100+ years have participated in the study. 

Dr. K. Warner Schaie is the founding Director of the SLS. Dr. Sherry Willis joined the study in 1984 and became study co-director in 2005. This website provides a wealth of material on the SLS. 

​Under the header About SLS, there is information on the history of the study, colleagues and staff currently involved in the study, and acknowledgement of the our many pre- and postdoctoral students who have contributed to the study over the past 58 years.

The header Publications provides links to study publications and conference papers.

Under Research, one will find descriptions of the study variables and measures; procedure for public access SLS data sets; and description of study samples.

The Participant section is designed specifically to provide study information to our many, wonderful, loyal participants and to the general public.​​​​​​​​​​​​​​

 Latest News

K. W. Schaie and Sherry Willis edited Handbook of Psychology of Aging, 8th edition.

 Seattle Longitudinal Study has moved to new address:

150 Nickerson St, Ste 101​​​​

Seattle, WA 98109 (see map)

The National Institute on Aging's booklet: Understanding Memory Loss: What To Do When You Have Trouble Remembering

Read NIH Senior Health article: Quitting Smoking for Older Adults​

Dr. Willis' ERA Living Lecture Series presentation: Healthy brain aging: Cognition in old age: The good, not so good, and potential plasticity  

National Plan to Address Alzheimer's Disease: 2013 Update​


Dr. Willis's latest publications


Dr. Schaie's latest publications