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13 year-old Jenny woke up one morning, wondering about her age. 

Her grandparents have been staying at her house for a week, and so she 
went to her grandmother.

"Grandma?" said Jenny. "Yes Dear?" replied her grandmother.

"How old am I?" asked Jenny. 

"Well, honey..." replied the grandmother, and after a few moments of 
thinking she answered - "You're 13."

"Wow grandma! How did you find that out?" wondered Jenny.

"Well, Jenny, last year you celebrated your 12th birthday, so I did 
the math and reckoned you must now be 13."

"Thank you grandma! You're so smart!" said Jenny, and headed off to 
her grandfather.

"Grandpa, grandpa, how old am I?" asked Jenny.

"Well, Jenny..." said the grandfather, and - after a few moments of 
thinking - said, "take off your blouse." 

So Jenny took off her blouse.

"Now take off your pants," said her grandfather. 

Jenny took off her pants with a bewildered look.

"Now your bra," said the grandfather. 

Jenny took off her bra, staying topless.

"And your panties, too!" demanded the grandfather. 

Jenny took off her panties, now completely naked.

The grandfather examined her for a few minutes and then said, 
"Well, Jenny, I suppose you're 13!"

"Wow, grandpa!" said Jenny, amazed, "how could you tell?"

Gramps replied, "I heard Grandma."


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[Lifted off zooass.com]

I'm not tense - just terribly, terribly alert.