Separating (1) children (2) people with disabilities (3) retirees and (4) other adults, is I would say an upper bound on complexity.<p>The PwD piece falls more under healthcare (which I think should probably just be universal), so if their health-related benefits can be separated out, they would just get the standard basic income.<p>Retirees only need special consideration for political reasons, since social security may exceed basic income, but it could also be separated out into a supplemental amount to make basic income more universal. Ultimately they could converge to avoid special treatment.<p>And whether children get the same amount as adults is an open question among BI advocates; I don&#x27;t have a preference either way and believe it should be studied empirically.