Considerable interest exists in identifying the characteristics of families that exhibit a high level of functioning. Since family strengths may be related to family stability, it is logical to examine long-term marriages for characteristics of strong and durable relationships. The present sample consists of 116 couples divided into two groups, higher family strengths and lower family sterngths, based on an empirical measure. Differences in the qualities of these families were identified. In most respects strengths found to be important in earlier studies of younger families also discriminated within long-term marriages. However, some variables may be more important in long-term marriages, including health, sexual relations, financial matters, and personality issues.