Same old couple

After leaving the doctors office, the old couple go to Mcdonalds. A biker is sitting down with his lunch and watches as the  husband orders their food. The old gent sits across from his wife. Opens the bag, removes a napkin, tears it down the middle, puts half in front of his wife and half in front of himself. He then cuts the burger down the middle and puts half on her napkin and the other half on his. He separates the fries into 2 equal piles each and the same with the soda. The biker figures that they must have financial issues and says to the couple, "I would be very happy to be able to buy each one of you your own meal." The old woman responds," We have been together our whole lives and we share everything, so as nice as it is for you to offer, No thanks." The biker understands and goes back to eating his meal. As he sits there he watches the old guy slowly eat his half the burger. Then he begins eating his fries one at a time and sips his soda as the woman just sits there, her food untouched. The biker again is a little surprised and can't help but to ask her why she hasn't eaten anything. She smiles and tells him, "As I told you, we share everything. I'm just waiting for my turn to use our dentures.