There might be a problem in the future with overpopulation, since the population of 2050 is 1.5 times the population of 2010, which is a huge growth. You can also see that there is a big difference in the population of Australia, even in 25 years, from 2025 to 2050, in the population pyramid slideshow.
The solution to the growing number of births, and the increasing number of people in the dependent age group of 0-14, in Australia, is to decrease births. The government can do this by implementing education for females about birth control.
Another problem is that the females significantly outnumber the number of males in Australia, especially in the senior age range, because of the sex ratio for seniors and. the life expectancy for them. A solution for males to live longer would be to have a better healthcare system especially designed for males, and to offer better nursing homes for them, where they will be able to participate in healthy, physical activities to exercise, so they will live longer