Effect of demographic change on Turkish Social Security System

World population is getting older over the years. This description which is called demographic change, shows that aged 65 and over population?s share increase in over against total population. Increasing life expectancy and decreasing fertility rate are the two parameters that effect this case. This change which is occur on population structure, carries some issues for countries. One of the big issues is social security systems? breaking down structures and deficits by increasing older population.In this study, it is presented that what extent the countries foremost Turkey are effected from demographic change and recommends are given that can be taken. In the first part of study, the demographic change notion is explained and statistics and projections are given to explain that what extent the countires effected form this issue. In the second part, the social security systems? historical process is informed with operating of the modern social security systems and selected countries? social security systems are analysed detailed. In the third part of the study, it is reviewed that what extent the countries? social security systems are effected from demographic change, presented the recommends which are taken over against this issue and social security system of Turkey?s analysed detailed witi social security reforms which have been made.Consequently, it is emerged that the demographic change has negative impacts on developed countries? social security system structure and the developing countries like Turkey will meet with this problem in the near future. In this context, the importance of the social security reforms? is verified and in this regard some recommendations are made.