How grown-ups actually make and keep friends | Shahmaran
Social
How grown-ups actually make and keep friends
A long read
Why friends were easy as a kid (and aren't now)
Think back to a friend you made in school.
You probably did not plan it. It just happened. As a grown-up, that almost never happens by itself. There is a real reason. And it is not you. Researchers have studied this since the 1950s. One sociologist, Rebecca Adams, named what close friendships need.
sociologist
A scientist who studies how people live together in groups.
She points to three things that grow friends. First, being near the same people. Second, running into them again and again, by accident. Third, a place where people relax and open up.
Sources
Aron, Melinat, Aron, Vallone & Bator, "The experimental generation of interpersonal closeness," Personality and Social Psychology Bulletin, 1997 — the 36 questions
Boothby, Cooney, Sandstrom & Clark, "The liking gap in conversations," Psychological Science, 2018
Jeffrey Hall, "How many hours does it take to make a friend?", Journal of Social and Personal Relationships, 2019
Zajonc, R. B., "Attitudinal effects of mere exposure," Journal of Personality and Social Psychology, 9(2, Pt.2), 1968 — the mere exposure effect and the quoted thesis (screens 14-16). VERIFY THE QUOTE WORDING against this paper before shipping; the canonical phrasings include "stimulus object" where the module has "stimulus".
Moreland, R. L., & Beach, S. R., "Exposure effects in the classroom: The development of affinity among students," Journal of Experimental Social Psychology, 28(3), 255-276, 1992 — the four silent confederates and the 3.62 to 4.38 attraction ratings (screen 15)
Office of the U.S. Surgeon General, Our Epidemic of Loneliness and Isolation: The U.S. Surgeon General's Advisory on the Healing Effects of Social Connection and Community, U.S. Department of Health and Human Services, 2023 — the quote, the cigarette comparison, the 26%/29% figures and the linked conditions (screens 38-42)
Holt-Lunstad, J., Smith, T. B., & Layton, J. B., "Social relationships and mortality risk: A meta-analytic review," PLoS Medicine, 7(7), 2010 — the original source of the cigarettes-a-day comparison the module cites as "a 2010 study" (screen 40)
Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D., "Loneliness and social isolation as risk factors for mortality: A meta-analytic review," Perspectives on Psychological Science, 10(2), 2015 — the 26% and 29% premature-death figures (screen 40)
Valtorta, N. K., Kanaan, M., Gilbody, S., Ronzi, S., & Hanratty, B., "Loneliness and social isolation as risk factors for coronary heart disease and stroke," Heart, 102(13), 2016 — the 29% heart disease and 32% stroke figures behind the advisory's linked-conditions list (screen 41)
Dunbar, R. I. M., "The Anatomy of Friendship," Trends in Cognitive Sciences, 22(1), 32-51, 2018 — the friendship layers and the ~40% of social effort given to the closest five (screen 29)
Roberts, S. G. B., & Dunbar, R. I. M., "The costs of family and friends: An 18-month longitudinal study of relationship maintenance and decay," Evolution and Human Behavior, 2011 — the measured decay evidence behind the three-year estimate (screens 27, 28, 31, 45)
Hall, J. A., Holmstrom, A. J., Pennington, N., Perrault, E. K., & Totzkay, D., "Quality Conversation Can Increase Daily Well-Being," Communication Research (online 2023) — the one-conversation-a-day stress finding (screen 18). Note only Hall is at the University of Kansas.
Wolf, W., Nafe, A., & Tomasello, M., "The Development of the Liking Gap: Children Older Than 5 Years Think That Partners Evaluate Them Less Positively Than They Evaluate Their Partners," Psychological Science, 2021 — the children's liking gap (screen 25)
Oldenburg, R., The Great Good Place, 1989 — the third place, neutral ground and the leveling of status (screen 33)
Rebecca G. Adams, quoted in Alex Williams, "Friends of a Certain Age: Why Is It Hard to Make Friends Over 30?", The New York Times, 13 July 2012 — the three conditions and the "since the 1950s" framing (screens 0, 43). This is a newspaper interview, not a paper; if a stronger anchor is wanted, Festinger, Schachter & Back (1950) is the primary proximity study.
Read end to end and corrected: August 9, 2026. Numbers checked: August 9, 2026.