The aim of this paper is to examine contemporary marital behavior of the population in Serbia older than 65 years. Models of marital behavior are a reflection of culture, tradition, local customs, economic status, cultural and historical heritage, and as such are subject to change. Extending the life expectancy of the population, and the change of socio-economic and cultural circumstances, had led to changing in marital behavior and marital structure of the old population. To track these changes and comprehend the current situation, we analyzed indicators such as the marriage and divorce rates for this age group, as well as current marital structure, comparing them with previous values. It is particularly noteworthy that for the first time (based on data from the 2011 census), we can analyze the frequency and characteristics of informal marriage unions (cohabitation), which provides important insights into the marital life of the elderly.