Studies pertaining to ageing play a prominent and increasing role in the biological sciences, public health, social work, and the behavioural and social sciences. At the individual level, the word 'ageing' can refer to a biological process, the transitions and transformations that occur to individuals in the latter portion of their life-span, or the well-being - in terms of physical and mental health, economic conditions, work and leisure - of those at older ages, often demarcated at 60 or 65 (Martin and ...