[@MetalLover]I think you still haven't told us the start date of this RP.
Is it 2280 or later?
Seriously, the reason why I asked for earlier dates because 20 or often even 60 years won't be even close to develop certain societies.
The very first Fallout game is set 84 years after the apocalypse and by then there are multiple somewhat developed post-apocalyptic societies there.
My impression is that people who were living in Vaults underground were the serious minority and most people spent their lives on the surface straight after the war. Which actually makes sense.
You can house only so much people underground.