[Since a trend seems to be developing in this thread for old guys to make fun of each other...]
Once upon a time there was an elderly couple, Albert and Jean. Poor old Albert had lost some of his hearing, and a few of his marbles. But his somewhat younger wife Jean could still communicate with Albert, and loved him dearly. Apart from his hearing and being a bit vague, Albert had been in reasonably good health. But this began to decline, and Albert was no longer feeling his usual self. So Jean took him to see the doctor...
The doctor did the basic examinations. Pulse, blood pressure, etc, and listened all over with his stethoscope. Then he sat down to talk with the couple.
"Well, Albert", said the doctor, "I can't find anything obviously wrong for a man of your age. So I'll have to run some more tests."
"Eh? Whaaat??", said Albert, who couldn't hear or understand properly.
"It's alright dear", said Jean, more loudly. "The doctor just needs to do some TESTS".
"Yes", said the doctor. "Now, Albert, I'd like you to come back tomorrow, and I need you to bring me: a urine sample, a faeces sample, and a semen sample. Do you think you can do that?"
"Eh? Whaaat??", said Albert, not comprehending.
"It's alright dear", said Jean, sweetly. "The doctor just needs me to bring him your pyjama pants."