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Abstract. This article examines changes in the co-development of personality characteristics and friendships across the lifespan. We address how personality traits shape friendship development (i.e., selection effects) and how friendships shape personality traits (i.e., socialization effects). By integrating separate empirical studies, we look at how selection and socialization effects change across the lifespan. A review of longitudinal research supports our hypothesis that selection effects on friendships intensify during adolescence, peak in young adulthood, and diminish throughout middle and late adulthood. Socialization effects through friendships seem to be moderately sized during adolescence, then small to negligible from young adulthood onwards. For future directions, we discuss effects of the transactional development of friendships and personality regarding associated dispositions within individuals, associated individuals within friendship dyads, and individuals associated within wider social networks.

Assuming individual differences in the satisfaction of affiliative needs, the authors hypothesize that people maintain friendships differently depending on the number and the quality of their horizontal family relationships, and this relates to differences in subjective well‐being. These predictions were tested in 2 studies involving German adults aged 30 to 86 years. Contrary to previous studies, the authors studied the importance of friends in relation to family relationships and identified friends in participants' networks based on predefined criteria. Results showed that less close relationships with horizontal family were accompanied by greater closeness to friends and vice versa, and this was related to higher well‐being. The findings demonstrate that people shape their relationships in accordance to their social environment, and benefit from doing so by enhanced well‐being.

Since it is still unclear to what extent time allocation retrospectively reported in questionnaires, reflects people's actual behavior, examining the accuracy of responses to time use survey questions is of crucial importance. We analyze the congruence of time use information assessed through retrospective questionnaires and through experience sampling methodology. The sample comprised 433 individuals ranging in age from 14 to 86 years. Participants completed standard survey questions on time allocation. In addition, a mobile-phone based experience sampling technology was used over a period of three weeks to obtain snapshots of, on average, 54 momentary activities in which participants participated while pursuing their normal daily routines. Experience sampling assessments were scheduled six times a day over at least nine days, including workdays, Saturdays, andSundays. Results indicate that the congruence between time allocation assessed with survey questions (i.e. in SOEP) and time allocation assessed with experience sampling methodology depends on the characteristics of the respective activities. Associations between standard survey questions and experience sampling methods are quite substantial for long-lasting and externally structured activities, such as paid work on workdays. Incontrast, associations between survey and experience sampling methods are somewhat weaker, though highly statistically significant, for less externally structured, short-term and infrequent activities, such as errands, housework, and leisure. These moderate and relatively small correlations may indicate either an error-prone estimation of the prevalence of shortterm and infrequent activities by experience sampling or respondents' overrating of sporadic and short activities in survey questions. We conclude that activities with a long duration, such as paid work, can be measured in a satisfactory manner using short survey questions. Futureresearch is necessary to elucidate which method (experience sampling method or survey questions) delivers more reliable and valid measures for shortterm and sporadic activities.Day Reconstruction Methods (DRM) should be included in this future methodological research.

Objective: Throughout their lives, people experience different relationship events, such as beginning or dissolving a romantic relationship. Personality traits predict the occurrence of such relationship events (i.e., selection effects), and relationship events predict changes in personality traits (i.e., socialization effects), summarized as personality-relationship transactions. So far, evidence was partly inconsistent as to how personality traits and relationship events are linked with each other. In this article, we argue that unnoticed age differences might have led to these inconsistencies. To systematically test for age differences in transactions, we conceptualize relationship events in terms of gains and losses and apply a developmental perspective on transactions. Methods: Using longitudinal data from three nationally representative samples (SOEP, HILDA, Understanding Society), we computed event-focused latent growth models and summarized the results meta-analytically. Results: The findings indicated some transactions. Of these, selection effects were stronger than socialization effects, and effects of gain-based events were stronger than effects of loss-based events. We observed few interactions with age. Conclusion: Selection effects and, particularly, socialization effects, tend to be rare and fairly independent of age. We discuss a series of broader and narrower factors that may have an impact on the strength of transactions across adulthood.

Whether couples have children or remain childless has largely been associated with individual and couple characteristics. We propose that the broader social network additionally differentiates between parents and childless couples, particularly between involuntarily and voluntarily childless couples. In light of this, we studied social network differences and their interplay with dyadic and individual characteristics in three types of couples with and without children, in a sample of 248 German early-midlife adults ( n = 41 voluntarily childless, n = 35 involuntarily childless, n = 48 traditional parental dyads). A multinomial logistic regression analysis revealed that social network characteristics distinguished between voluntarily and involuntarily childless individuals. Additionally, attitudes toward children differed substantially across types of couples, whereas levels of partnership distress did not. Findings provide new insights into the significance of the social network above and beyond dyadic and individual characteristics in early-midlife couples with and without children.

The authors propose a model of relationship differentiation that is based on two psychological mechanisms, the regulation of emotional closeness and the monitoring of reciprocity. Both combined are expected to define relationship systems of differential reproductive significance: Relative to others, kin relationships are predicted by higher closeness and lower reciprocity, cooperative (non-kin) relationships by lower closeness and higher reciprocity, and partner relationships by both higher closeness and higher reciprocity. These assumptions could be confirmed by two studies involving 455 young adults and 171 middle-aged couples from different family forms (i.e., traditional and patchwork families, involuntary and motivated childless couples). Effects varied primarily due to parental investment such that parental partners become less distinguishable from kin, or, in other words, more like "elected kin". Results highlight the flexibility of relationship differentiation.