Introduction to the special section on loneliness across the life span.

We provide an overview of the topics included in the special section of the International Journal of Behavioral Development on Loneliness Across the Life Span. We highlight the use of a life span approach to understanding loneliness and the different methodological approaches adopted by researchers. This special issue contributes toward the development of a holistic research agenda addressing loneliness across the life course and away from a focus solely upon specific age groups such as adolescents, young adults, or older adults who have been the focus of most loneliness research until comparatively recently. [ABSTRACT FROM AUTHOR]