While your father might not have any physical ailments, it’s important to acknowledge his mental health. As we age, the possibility of depression grows significantly. Senior isolation is a serious issue, so it’s very possible that your father may be dealing with depression. Some of the symptoms include lack of sleep, lack of appetite, and general lethargy. You’ll first want to talk with your father to see if there is anything you can do to help. If you don’t notice any issues, make sure that you reach out to a trained professional.