I am sorry to say that acupuncture works at some age and he is already  70 + I think you can give him hot water lemon and rock salt or sea salt that will help  him thanks ....

This is clearly a case of sluggish bowel movement and Constipation. It would be good to continue with what you are doing with the dietary pattern. Make sure to give him adequate liquids like water, fruits and fiber rich food. You could also try with giving him warm water before going to bed and also on waking up in the morning. Acupuncture therapy can be of good help in managing his sluggish bowels.