A 10-year-old debt is almost certainly past your state's statute of limitations for collection (typically 3-10 years), so the collector cannot successfully sue you for it. Ignoring the collector is generally safe, but a more reliable approach is to send a written cease-and-desist letter under the Fair Debt Collection Practices Act, which legally requires the collector to stop contacting you. Do not make any payment or acknowledge the debt in writing, as either action can reset the statute of limitations in some states.
The statute of limitations across states. The clock for suing on consumer debt varies by state, typically 3-10 years from the date of last payment. Most states are in the 4-6 year range. After that period, the debt is "time-barred" and a complete legal defense exists. A 10-year-old debt is past the statute almost everywhere in the U.S.
Why collectors still pursue old debt. Collectors purchase old debt for pennies on the dollar (sometimes $0.01-$0.05 per dollar) and try to collect through phone calls, letters, and intimidation. Even getting 5%-10% of borrowers to make a partial payment is profitable at those purchase prices. Collectors know most consumers do not understand the statute of limitations.
The reset risk. If you make any payment on the debt, even $1, the statute of limitations restarts in many states. Some states also restart the clock if you acknowledge the debt in writing. So a phone agreement to "send $50 as good faith" can convert a time-barred debt back into a fully suable debt for another 4-10 years.
Send a cease-and-desist letter. Under the FDCPA (15 U.S.C. § 1692c), you can demand in writing that the collector stop all communications. The letter must be in writing (a phone request does not count). After receiving the letter, the collector can only contact you to confirm they will stop or to notify you of a specific legal action (like a lawsuit).
Sample cease-and-desist letter. "Re: Account [number]. Pursuant to 15 U.S.C. § 1692c(c), I demand that you cease all communication with me regarding this debt. Do not contact me or any third party about this debt by phone, mail, email, or any other means. Sincerely, [your name]." Send via certified mail with return receipt.
What the cease-and-desist does and does not do. It stops collector communication. It does not extinguish the debt; the debt still exists on the original account. It does not remove the debt from your credit report (which it would have already fallen off after 7 years from date of first delinquency). It does not prevent the collector from selling the debt to another collector, who may try to contact you anew.
Credit report status. Debts older than 7 years from the date of first delinquency cannot legally appear on your credit report. If a 10-year-old debt is showing on your report, dispute it with the credit bureaus (Experian, Equifax, TransUnion). Provide documentation of the original delinquency date if available. The bureaus must investigate and remove unverifiable old entries.
If they sue you anyway. Collectors sometimes sue on time-barred debt hoping you will not show up to court. If you do not respond, the court issues a default judgment. To prevent this, always file an Answer when served with a lawsuit, even if the debt is decades old. Raise "statute of limitations" as an affirmative defense; the case is usually dismissed.
The do-not-call list. Registering on the National Do Not Call Registry (donotcall.gov) can reduce sales calls but does not stop debt collection calls. Collection calls are exempt from the registry rules; the FDCPA is the legal framework for stopping them.
If you decide to settle anyway. Some borrowers prefer to settle old debt for closure even if it cannot be enforced. Settlement on time-barred debt can be very low (10%-20% of the balance) because the collector knows their leverage is limited. Get the agreement in writing and pay only with a method that does not include your bank account number (cashier's check is safest).