Three Ladies

Three ladies were discussing the travails of getting older.
One said :
- Sometimes I catch myself with a jar of apple sauce in my hand, while standing in front of the refrigerator, and I can't remember whether I need to put it away, or start making a flan.
The second lady said :
- Yes, sometimes 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 said :
- Well, ladies, I'm glad I don't have that problem.
Knock on wood, as she rapped her knuckles on the table, and then said, that must be the door, I'll get it !