leslie56, Miriam suggest Internal Medicine--they all have the Geriatrics title now by simple designation. But rather than focus on aging, thorough attention to his physical condition could be helpful. Physicians are reluctant to order complete iron panels, but you might insist. Testosterone levels might benefit from a boost, but really CBC, MET, B vitamin status could all be revealing of a fairly simple resolution to tiredness and memory. I love that you are doing the best for him as he has for you all these years.