App Immuni non available on IOS 12.4.7

I am going to download App Immuni in Italy, this app is introduced by the Italian Government to track covid-19 cases.

This app require IOS 13 or later, but on my iPhone 6 i’m not able to download the app.

I think that this app should be downloadable on every Apple device, given its importance.

I am referring to the apple community for apple to consider the issue.