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The general rule in most states is that any income or retirement income that is earned DURING THE MARRIAGE is subject to division between the parties, regardless of ability of either party to earn. Think of it this way: when you get married, any assets, income you make or she makes, retirement, etc all goes in to a communal pot and belongs to both of you.
Now, that's the general rule. However, Judges do have discretion when dividing up property. So let's say hypothetically, you had the following property and income that you earned during the marriage: a house (bought during the marriage), retirement plan that you put 4k into during the marriage, and two cars. The Judge could divide that in any number of ways. It wouldn't have to be split down the middle. He could award you your retirement plan and give your wife the equity in the home, for instance.
Unless you and your wife signed a prenuptial agreement OR a post nuptial agreement stating that she would not have any rights to your retirement money, in the event of a divorce, she could ask the Judge to award her some of that money. This is true whether or not she's capable of working or not.
Ah, okay, if you earned it before the marriage, she doesn't get any of that. That is considered your separate property.