@Stephen ******************
You can't switch reasons like that. You are already on a non-O visa, so you cannot apply for a different non-O visa. If you want to switch to retirement you would have to either leave and return without using your visa (might not be possible while your multiple entry visa is still active) or you would need to apply for the 1-year extension based on marriage and then next year when you are due for an extension you could apply based on retirement instead. But you can't switch from non-O marriage to non-O retirement, and you cannot switch from non-O marriage to extension based on retirement. You can only switch from one extension to a different extension.