Friendships Across the Lifespan: What Changes Over Time

The Lifespan Trajectory

Friendship networks follow a predictable pattern: they grow during childhood and adolescence, reach their peak in early adulthood(ages 20–30), and then shrink steadily. Wrzus et al. (2017) showed in a meta-analysis that the decline mainly affects peripheral contacts, while close friendships remain more stable.

At the same time, the composition shifts: the share of family relationships in the network grows with age, while friendships decline proportionally. This is not a loss — it is a strategic reallocation.

Socioemotional Selectivity Theory

Laura Carstensen’s theory explains the mechanism: when remaining lifetime is perceived as limited, goals shift from information seeking to emotional regulation. People choose relationships that maximize positive emotions.

This explains why older adults are more satisfied with their friendships: they have actively kept the relationships that serve them well and let go of the rest. Friendship quality rises because selection becomes more deliberate.

What Changes in Each Phase

In childhood, friendships form through physical proximity and shared play. In adolescence, self-disclosure and shared identity become central. In early adulthood, work and study friendships dominate.

From mid-adulthood, partnership, children, and career compete for time. In later life, opportunity structures fall away — retirement, moves, losses. Dunbar (2025) emphasizes: maintaining remaining friendships becomes especially important for health.

Health Implications

The shift from quantity to quality is healthy — as long as a minimum level of social interaction is maintained. The problem arises when the network falls below a critical threshold and loneliness sets in.

The challenge in later life: without deliberate investment, even remaining close friendships can fade. Regular contact — at least once a week — is needed to maintain the neurochemical benefits of social bonding.

Frequently Asked Questions

Why do older people have fewer friends?

Socioemotional selectivity theory explains: as people age, they perceive remaining lifetime as limited. They deliberately invest in fewer, emotionally satisfying relationships instead of many superficial ones.

When do people have the most friends?

Network size peaks in early adulthood (ages 20–30) and then declines steadily. At the same time, the network shifts increasingly toward family relationships.

Do friendships get better with age?

Yes, in terms of quality. Older adults report higher satisfaction with their friendships, fewer conflicts, and greater emotional closeness — because they invest more selectively.

Can you still make new friends later in life?

Yes, but it gets harder. The opportunity structures (school, work) fall away. Structured activities like clubs or volunteer work create new contact opportunities and make it easier to build trust.