Links Between Best-Friendship Quality and Well-Being From Early Emerging Adulthood to Early Established Adulthood.

The aim of this study was to verify whether the links between features of best-friendship quality (intimacy, reliable alliance, conflict) and well-being indicators (self-esteem, loneliness) change from early emerging adulthood to early established adulthood. The moderating effect of gender and investment in romantic life on these links was examined as well. For the purpose, 346 individuals (58% women) completed questionnaires at age 20 and again at age 30. Multilevel analysis were performed for each well-being indicators separately. The results showed reliable alliance to be associated with both well-being indicators, and intimacy to be associated with loneliness. Age moderated the effect of intimacy on self-esteem, whereas investment in romantic life moderated the effect of reliable alliance. Finally, triple interactions emerged between conflict, gender and age in their associations with self-esteem and loneliness, underscoring particularities for men. These results underscore the most influential features of friendship quality for well-being.