Analysis of information sources in references of the Wikipedia article "Royal Italian Army during World War II" in English language version.
Like the Greek Army, the Regio Escerito was raised by conscription, and all male citizens between the ages of 18 and 54 were liable for military service... During World War II youths were conscripted for active service at the age of 18 without undergoing pre-military training.
In 1925 the resident population before the Treaty of Lausanne obtained Italian citizenship, although without political rights and without the obligation of military service.
In Peacetime this was divided into three stages: pre-military training (between 18 and the completion of the trainee's 20th year), conscript service (lasting 19 months from the conscript's 21st birthday), and post-military training (from the completion of the conscript's service until 33rd birthday), followed by transfer to active reserve status (between his 33rd and 54th birthday). During World War II youths were conscripted for active service at the age of 18 without undergoing pre-military training.