As adults, it’s easy for life’s responsibilities—careers, families, health goals—to take priority over friendship. Yet, research shows our social lives play a major role in maintaining brain health and emotional well-being, especially as we age. Meaningful relationships aren’t just nice to have—they’re essential fuel for mental fitness.

A recent study followed U.S. adolescents into adulthood and discovered some important lessons for all of us. The study found that teens who felt more connected to their families were much more likely to report strong, satisfying social relationships in their 30s and 40s. This study focuses on adolescent experiences, but its message is also important to older adults and those who care for them.