"Mortgages don't expire."
You will have to check your state law to see if that statement is true.
In IN if you file a mortgage without a maturity date it is only good for 10 years from the date of filing. If there is a maturity date then it is good for 10 years from the maturity date. Indiana Code 32-28-4-1
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The opinions expressed are mine and they are not to be taken as legal advice.