"Many of us, after reaching a certain age, notice that we have to urinate more frequently and with more urgency. The standard assumption, that seems to have become part of our folklore, is that your bladder shrinks as you get older. We found that this may not be the case," said Neil Resnick, M.D., professor and chief, division of geriatric medicine, University of Pittsburgh School of Medicine.

I guess that's an old wives tale that I never heard. It would never have occurred to me.

Science Daily: The Bladder Does Not SHrink As You Get Older - Linked from BoingBoing