Social activity and healthy aging: A study of aging Danish twins

Matt McGue, Kaare Christensen

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


Although social and intellectual engagement have been consistently associated with late-life functioning, rather than true causation, these associations may reflect the experiential choices of high functioning individuals (i.e., selection effects). We investigated the association of social activity with late-life physical functioning, cognitive functioning, and depression symptomatology using data from 1112 pairs of like-sex twins who participated in the Longitudinal Study of Aging Danish Twins. Consistent with previous research, we found that social activity was significantly correlated with overall level of physical functioning, cognitive functioning, and depression symptomatology. We also found that social activity was significantly and moderately heritable (estimate of .36), raising the possibility that its association with late-life functioning might reflect selection processes. Further, social activity did not predict change in functioning and in monozygotic twin pairs discordant on level of social activity, the more socially active twin was not less susceptible to age decreases in physical and cognitive functioning and increases in depression symptomatology than the less socially active twin. These results are interpreted in the context of the additional finding that nonshared environmental factors, although apparently not social activity, are the predominant determinant of changes in late-life functioning.

Original languageEnglish (US)
Pages (from-to)255-265
Number of pages11
JournalTwin Research and Human Genetics
Issue number2
StatePublished - Apr 2007

Bibliographical note

Funding Information:
This work was supported by grants from the U.S. National Institute on Aging (P01-AG08761) and the Danish National Research Foundation.

Funding Information:
The authors acknowledge funding support from the National Institute on Aging. The views expressed are those of the authors of this paper, and not the National Institute on Aging, the National Institutes of Health or the Department of Health and Human Services.


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