One grandma calls out, "I bet we can tell how old you are!"
Grandpa replies, "You crazy old cows can't guess what day it is. How do you think you can guess my age?"
The grandmas reply, "Drop your pants and underwear, and we'll be able to tell."
Grandpa was embarrassed, but he was determined to prove he was right, so down came his knickers.:flyingunders:
"Now, turn around 3 times, then jump up and down," shouted the grandmas.
Granpa did as they asked, and the grandmas shouted, "87, you're 87!"
"You're right," says grandpa in amazement. "How did you know that?"
"You old fool," they giggled. "We were at your birthday party yesterday!":bday7: