Abstract
Life tables are the most important means by which help in estimating the number of people expected survival for a period of five or ten years next of the total population or a particular age group of the population in many of the issues of demographic and economic, got significant developments in the construction of life tables since before Gohn Grount in the history of demographic analysis (1662) and even the researcher Danial Hamermesh in the year (1985), depending on the individual expectations about survival, and by asking the following question:- How expects percent of you will live at least T years of age?T represents the age of death of the individual, because the individual alone is unable to determine the remaining period of his life depending on the social and economic factors and health experienced by, and also because studies have shown that the average life expectancy has increased in the recent period in most countries, where researchers have begun in the United States American study of life expectancy and self determinants over a long period of time, and found significant and positive effects of health and social factors, economic, so you must know the factors that affect the life expectancy and the reasons for self-study.
