Patient at that age with those symptoms may have the diagnosis of Depression.But is that depression is primary or secondary to medical conditions and/or dementia, a detailed medical and psychiatric evaluation is to be done.
Diabetes, Blood pressure, Hypothyroidism, VIT D or or other vitamins deficiencies should be ruled out.
Next Steps
As mentioned above , there is a need for medical and psychological evaluation.Dementia pts generally present with difficulties in the memory processes.Forgetting can make them irritable and some of the complaints as mentioned.
Health Tips
Please take an opinion from a psychiatrist and a physician.A detailed history and examination is required for coming at a diagnosis and further management.