Ever wondered where the tipping point is between carefree youth and middle age?

For residents of Brisbane's western suburbs it appears to be precisely at Indooroopilly's Walter Taylor Bridge.

The Walter Taylor Bridge at Indooroopilly marks a tipping point into middle age. Credit:Queensland Government

The Australian Bureau of Statistics on Monday released median age figures for Australian suburbs based on 2016 Census data.

Examining the figures for Brisbane reveals the river represents a clear boundary in the city's west, from the student-dominated suburbs surrounding the University of Queensland to the family belt on the far side.