All residential dwellings in the PAC District shall be occupied by persons 55 years of age or older, with the following exceptions:
A. A husband or wife under the age of 55 years who is residing with his/her spouse who is 55 years of age or over.
B. Offspring 21 years of age or older residing with their parents, parent or guardian where one of the parents with whom the offspring are residing is 55 years of age or over.
C. One adult under 55 years of age may be admitted as a permanent resident if it is established that the presence of such person is essential to the physical care of one of the adult occupants who shall be 55 years of age or over. If more than one adult under 55 years of age is necessary to care for the adult occupant 55 years of age or over, approval shall be obtained from the homeowners' association and/or condominium association based on reasonable and specific standards and criteria to be developed by those entities.