Objectives: Secure adult attachment may promote health and well-being in old age, yet is understudied in this life phase. Consequently, we aim to examine associations between adult attachment and mental and physical health and quality of life, both concurrently and longitudinally.

Methods: We used three phases of the Whitehall II study (n = 5,222 to 6,713). Adult attachment was measured with the Relationship Questionnaire (RQ) at 48–68 years. Mental and physical health was measured concurrently and 14 years later; quality of life was measured five years later. We used linear regressions to examine associations, controlling for age, gender and education.

Results: Almost half, 46% of participants, were classified as secure, 13% as preoccupied, 34% as dismissing and 7% as fearful. Adult attachment was associated with mental and physical health, concurrently and 14 years later, and with quality of life five years later. Preoccupied and fearful participants had poorest mental health and quality of life; dismissing participants held an intermediate position. Insecurely attached participants tended to report poorer physical health.

Conclusions: Adult attachment has enduring associations with mental and physical health, which suggests that the construct of adult attachment itself is stable in this phase of the life course.