THE ABSENT MINDED OCTOGENARIAN

An octogenarian visited his doctor
'I think I'm getting senile” he said
The doctor replied “I don’t think you are senile
Let’s look for a different diagnosis instead”
“But I keep forgetting to do up my fly”
The old man said “After I’ve been for a pee”
The doctor smiled and then replied
“Not opening your fly before you start, that’s senility”