ex-wife credit card debt

My boyfriend now lives in Michigan (since 1995). Prior to 1997 when his divorce was final, his wife ran up credit card debt in California on cards issued to him. His divorce attorney advised him not to pay the debt plus he can't afford to pay the debt. All debt was turned over to collections, but the agencies have stopped calling him.
1. Would California or Michigan law apply?
2. What is the statute of limitations on credit card debt in each state?
3. He has some real estate that he is considering selling to purchase a business. If he sells the property can the creditors attach the funds?

He would need to press fraud charges on the ex-wife. It probably wouldnt fall under state law as I assume it is a notional or international credit card?? There usally are not any statute of limitations on unpaid debts as long as they remain unpaid they are still a collectible debt at least here in the state of Ohio they are. If he is trying to sell or purchase real estate they may be able to attach it. Garnishment is also an option for them and very possible.

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1) I don't know
2) California 4 years; Michigan 6 years [url]http://www.cardreport.com/laws/statute-of-limitations.html[/url]
3) I don't believe so, unless he has been sued and lost.

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