There are many risk factors for committing suicide known today, and old age is considered as one of the most important ones among them. Since the process of population ageing in Republic of Croatia, as well as in most of the developed countries in the world, has been going on for years, the number and percentage of older people in general population has been increasing. Considering that the suicide rate is higher within that group, the increase in the number of people of old age will probably lead to the increase of the number of suicides. The goal of this paper is to research the characteristics of suicides in the City of Zagreb and the Zagreb County area in the time period from January 1st 2011 to December 31st 2015, with special focus on the differences between the younger and older population. Autopsy records of the Department of Forensic Medicine and Criminology, Zagreb University School of Medicine, were used to gather demographic data about the people who committed suicide in the five-year time period. There were 816 people in the studied sample, divided into two groups: persons under the age of 65 and persons 65 years of age and older. The two groups were then compared by gender, marital status, level of education, blood alcohol levels and the method of committing suicide.The results showed that the ratio of men and women who committed suicide is the same in the older and the younger age group, while the biggest differences in suicide rates between those two groups were among singles and people with higher levels of education. People of older age also used firearms as a method of committing suicide more often. This type of data is necessary for better understanding the risk factors for committing suicide in old age, which is needed to prevent the further increase of the number of suicides in that population.