Blockchain enthusiast new to Cardano's view

[RobJF]

I know almost nothing about it, so sorry if this doesn’t help, but I guess it might…

Mechanics of creating addresses for ada wallets

Can someone explain how addresses are created on the blockchain?, if there is a limit to how many addresses that can be created? Is it possible for addresses to double up? And if an address can be created for every person on the planet as a retirement fund that is secure similar to like a 401k or superfund and funded through the entire working life of the address owner depending on that persons income