@Aldarion Austrian Germans in Austria-Hungary married late:
Czechs, Poles, Slovenes, Italians, and Budapesters got married at an intermediate age while everyone else got married at a young age.
@Ricardolindo You can see the Greek Catholics in Northern Transylvania and southwestern Ukraine (Galicia and Subcarpathian Ruthenia) on this map:
https://archive.ph/8kpmx