For those that might be interested, in Canada, OAS was very similar to SS. It was funded separately but the collected funds were not kept separate. Finally it was rolled into general revenues on the input side. Much later, it was subject to a means test so that once you exceed about C$70k gross, it starts to be clawed back becoming fully clawed back at around C$130k. This is based on individual income so a spouse can still claim it if the income is low enough. Income splitting is allowed but not for OAS.
As Danmar has said, I include the present value of DWs OAS as fixed income. And like SS, it is only available at age 65.
For the fun of it...Keith