City of Onkaparinga Age structure Share Twitter Facebook LinkedIn Email City of OnkaparingaAge structure maps To view how different age groups are distributed across the City of Onkaparinga, select from the list of thematic maps below: Median age 0 to 4 year olds 5 to 11 year olds 12 to 17 year olds 18 to 24 year olds 25 to 34 year olds 35 to 49 year olds 50 to 59 year olds 60 to 69 year olds 70 to 84 year olds 85 years and over Under 18 years 65 years and over