Senile
90 year old man goes into a house of ill repute and asks the girl on reception if he could see one of the girls for a couple of hours, the receptionist said "I think I had better see the madam of the house, could you sit and wait for a minute". 2 minutes later the madam arrived and said " has no one told you, you have had it?" "oh sorry" said the old man "how much do I owe you?"
I saw the doc yesterday I said "I think I am going senile"
"why is that Mick" he asked
"well I keep forgetting to zip up my fly after going to the loo"
"not to worry mick senile is when you forget to unzip your fly"