Yes. Sometimes, postnuptial agreements are designed with an end date in the original agreement. For example, an agreement could provide that, if the couple is still married 15 years after the agreement was signed, it will become null and void.
As with any type of legal contract, both parties could mutually agree to terminate and revoke a postnuptial agreement or to change one or more of its provisions. Any such revocation or change should be made in writing, following the same legal formalities as the original agreement.
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