I have a well an lately it seem as though the pump I turning on more than it should. I have a 30 gal expansion tank and when my wife runs one faucet for acouplle of minutes the pump cycles about three times. The tank is about 20 yrs old an I was wondering if the bladder in the tank was bad.

Probably. Depress the air valve at the top for a few seconds. If water comes out, then it's toast. Replacement is generally the only option. You can also watch the pressure gauge while a couple of faucets are on. You will probably note the pressure dropping and then recovering in just a matter of a few seconds instead of several minutes as it should be.