What is the average age at which Australians start to use methamphetamine / amphetamine?

Among Australians (aged 14 years and older) who have ever used methamphetamine or amphetamine†, the average age at which they first tried it was 22 years. 

Source: Australian Institute of Health and Welfare (AIHW). 2022-23 National Drug Strategy Household Survey

†  Methamphetamine or amphetamine: The NDSHS asked about the use of methamphetamine and amphetamine (including the street names speed, crystal and ice) in 2022–‍2023. In 2019 and prior years, the NDSHS asked about the use of “Meth/amphetamines”, which also included the non‑medical use of pharmaceutical amphetamines, such as Ritalin (methylphenidate) and pseudoephedrine based cold and flu tablets. The change represents a break in the timeseries. Results for methamphetamine and amphetamine in 2022–‍2023 should not be compared to meth/amphetamines results from previous survey waves.