The statute of limitations upon any claim of the county or state for expense of care of the mentally ill as provided herein may not commence to run until the death of the mentally ill patient, but action may be begun at any time during the life of the mentally ill person. This chapter does not affect rights and duties that matured, penalties that were incurred, and proceedings that were begun before July 1, 1975.
SDCL 27A-13-33