My Receding Memory

Let me preface this by stating that lately I've been concerned with my memory. It seems I forget things that, ten years ago, I would have remembered.
A couple of days ago I was in line at the drug store when a woman seated in the waiting area began a conversation with me. It went something like this.
"Hi, how are you?"
"Fine, how are you?"
"Okay. I don't see you around much."
"Oh, well I've been around."
"Are you still out walking?"
I do go out walking sometime, and figure I must have spoken to her on the street, but I have no idea who she is.
"I walk some, but not too often."
"And you're not wearing your hat."
A hat? What hat?
"Well, I only wear a hat when it's really hot."
By now I'm searching the deepest recesses of my memory to recall this woman.
"Did you walk over hear today?"
"No, that would be a long walk."
"It's only a mile or so."
Now I'm beginning to suspect that perhaps it's not my memory that's the problem.
"I'm sorry, Ma'am, but who do you think I am?"
"I don't remember your name, but we run into each other all the time over on Euclid."
"I'm sorry, Ma'am, but I don't live near Euclid. I live up at Blooms Crossing."
The woman leans forward and squints and her face becomes red.
"Oh, I'm sorry, you look just like the man I run into while I'm out walking."
"Poor guy."
It's a good thing I don't live on Euclid or I would have never realized it was my memory that was fading.