An aged infirm person is a person over the age of 65 years so incapacitated mentally by the degenerative processes of old age, or so incapacitated physically, as to require continuing infirmary care.

A county infirmary is a county institution created pursuant to sub. (1) or (2) under the general supervision and inspection of the department pursuant to ss. 46.16 and 46.17 as to adequacy of equipment and staff to treat, care for and maintain the physical and mental needs of aged infirm persons.