Hi...my father aged 78yrs is diagnosed with Alzheimer's for last 5 year's. I m 36year old, worked in defence services for 17years. I am not able to concentrate steadily. not taking any problem seriously. As a student I was very good at studies but now lacking determination. I remember old things clearly but not concentrating while talking to others or discussing something important. Forgetting immediate commitments made on phone calls after disconnect the call...etc. do I need to consult doctor?