My Grandfather, William Joseph Bannister, service number 1912, was 21 years old (DOB 09/07/1895) when he enlisted in the Australian Imperial Force (AIF) on the 15th of January, 1915.
In January 1918, Private Bannister was “severely reprimanded” for being in Bailleul (France) without a pass….. I suspect there was a mademoiselle involved.