senile

Of, or relating to old age.

Similar studies of rats have employed four different intracranial resorbable, slow sustained release systems— […]. Such a slow-release device containing angiogenic factors could be placed on the pia mater covering the cerebral cortex and tested in persons with senile dementia in long term studies.

Exhibiting the deterioration in mind and body often accompanying old age; doddering.

Her mother was senile, but they called it dementia now.

A person who is senile.

Seniles differ markedly in their early adult intelligence level, and in their social, vocational, and educational histories.