[Qwertious]

Which decades-old games are Paradox getting lots of money from? HoI4 released in 2016, are people really buying the original HoI (from 2002)?

[sofixa]

Crusader Kings II and Europa Universalis IV are still seeing high amounts of players, with EUIV in particular getting recent DLCs that sell well. Released in 2013, it's a decade+, and it will be at least a year or two before EUV comes out.