Overall, Australian women usually had their first child between the ages of 20 and 30 while there were a few of people do this beyond 40 years old. However, the trend of being first-mom at over the ages of 30 was increasing year by year.

Looking at the graph, women started having the first child between the ages of 20-24 reaching 60 percent in 1966, almost twice as high as those under 19 years old. Both of these age groups experienced a rapid decline in first-time motherhood during the process, with 40 and over 30 percent for 20-24 years old and 19 years old, respectively.

In contrast, the proportion of women choosing to become mothers for the first time at 30 years old increased significantly, especially in the 30-34 age group, jumping from over 10 percent to a peak of nearly 50 percent in 2006. The same goes for the 34-39 age group also from less than 10 percent to 30 percent during the process. For women aged 25-30, the growth peaked in 1986 with 50 percent and then dropped to 40 percent 20 years later, while the age group over 40 had not much change and remained below 5 percentage of women giving birth to their first child during the period.