Alzheimer's disease?

Two guys, one old and one young, are pushing their carts around Home Depot when they collide.

The old guy says to the young guy, "Sorry about that. I'm looking for my wife, and I guess I wasn't paying attention to where I was going."

The young guy says, "That's OK. It's a coincidence. I'm looking for my wife, too. I can't find her and I'm getting desperate."

The old guy says, "Well, maybe we can help each other. What does your wife look like?"

The young guys says, "Well, she is 27 yrs. old, with red hair, blue eyes, long legs, big boobs, and she's wearing tight white shorts. What does your wife look like?"

The old guy says, "Doesn't matter.....let's look for yours."