is a medicine used for gastritis-it reduces the acidity of the stomach secretions. It does not have any proven effects on bowel movements.
Gastritis is common in elderly and we do use it-but for gastritis, not to aid bowel movement.
It seems to me that your basic concern is constipation/improper bowel habits. For a proper bowel movement, you need to drink plenty of water, and take in plenty of fibre rich food (fruits, vegetables, whole wheat bread, oats etc) and keep yourself active.
I would also advise you to consult a physician/surgeon with your symptoms (as altered bowel movements can be caused by few serious diseases especially in your age and it may not be physiological/normal) and get thoroughly examined so that the appropriate treatment can be prescribed.