N.H. Rev. Stat. Ann. § 211:64-c

No fee, including the agent's fee, shall be required for the issuance of a license under the provisions of RSA 211:64-b for the taking of clams by a resident of the state who is 68 years of age or over. Such license shall be effective for the remainder of such resident's life, as long as the applicant remains a resident of the state, unless sooner suspended or revoked by the executive director. The minimum residency requirements of RSA 214:7-b are applicable.