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As an outcome of demographic transition the composition of the world's population has changed. In turn percent share of population above 60 years of age will be doubled from 11 percent in 2010 to 22 percent in 2050 worldwide [United Nations (2011)]. Those countries which encountered demographic transition early are now facing the problem of ageing societies. In developing countries, demographic transition started late, and they have not yet encountered the problem of a large proportion of elderly in the population. However, in the coming years with the high proportion of elderly, these countries will also have to face the problems with their poor economic situation and burden of diseases. Therefore it will be a difficult task for developing countries to combat the problem of the large proportion of elderly in the population in the coming years if concrete steps have not been taken at this time. Pakistan, where demographic transition started in the 90's, has almost six percent (more than nine million) of the population above 60 years of age in the year 2005, and it will rise to 16.5 percent (48 million) in the year 2050. If we look at the ageing index, which is the number of persons 60 years of age or above per hundred persons below 15 years of age, the value was 15.9 in 2005. It will rise to 29 in 2025 and further to 75.5 in the year 2050 due to decline in fertility and steady increase in life expectancy. The old-age dependency ratio has also increased from seven in 2005 to nine in 2025 and will reach 16 in the year 2050 [UN (2006)].

Access to clean drinking water and sanitation facilities have a direct positive impact on health through prevention of water-borne diseases, especially diarrhoeal morbidity of children. Lack of WES (Water and Environmental Sanitation) services and poor hygiene practices in Pakistan contribute significantly to the prevalence of diarrhoea, a major cause of infant death and children less than five years of age. The estimates show that about 30 percent of total deaths among children are attributed to diarrhoeal disease [Gallup (2001); UNICEF (2000)], and 4.1 years in life expectancy can be added if water borne diseases are eliminated [Ali and Haq (2003)]. Hence, reduction of diarrhoeal morbidity stands out as an important policy goal, which can ultimately lead to reduction in infant/child mortality. In this paper, we shall examine the relationship of WES interventions with that of the incidence of diarrhoea among children under age 10.

Movement of the people within the geographical and administrative boundaries of a country is known as internal migration. Researchers regard the movement to urban areas from both rural and less-advanced urban areas as more important, yet studying the dimensions of movement between rural areas is worth investigating. Scholars assert economic incentives as the main motive behind the rural-urban movement; various unforeseeable factors, however, may also stimulate the human flows. In Pakistan, the phenomenon of internal migration is as old as the inception of the country as Helbock (1975a) maintained, while studying life-time migrants in 12 largest cities of the country in 1961, that almost every 7th person residing in these cities had come from a different district