1‘she couldn't cope with her senile husband’
doddering, doddery, decrepit, aged, long in the tooth, senescent, failing, declining, infirm, feeble, unsteady, in one's dotage, losing one's faculties, in one's second childhood, mentally confused, suffering from senile dementia
informal past it, gaga, soft in the head
in the prime of life
We take a look at several popular, though confusing, punctuation marks.