Do you talk to strangers?

I was in the garden yesterday and this elderly lady - over 80?, stopped and said hello and we talked for a while, then she asked me what my flat number was. I told her and she said she will call in one day and have a chat.
Okay said I, she was repeating herself and seemed a little forgetful.
If she does turn up, I will invite her in for a chat.
Best get some tea.