Old Age

Three older ladies were discussing the travails of getting older. One said,
"Sometimes I catch myself with a jar of mayonnaise in my hand in front of
the refrigerator and can't remember whether I need to put it away, or start
making a sandwich."

The second lady chimed in, "Yes, some times I find myself on the landing
of the stairs and can't remember whether I was on my way up or on my way
down."

The third one responded, " Well, I'm glad I don't have that problem; knock
on wood," as she rapped her knuckles on the table, then told them "That must
be the door, I'll get it!"