One of the unique things about the human brain is that it can do only what it thinks it can do. The minute you say 'my memory isn't what it used to be' or 'I can't remember a thing today.' You are actually training your brain to live up to your diminished expectations.
Deepak ChopraMeditation is a good starting point, or even a little bit of contemplative reflection, asking questions like: Who am I without my name or form? What is my purpose if there is one? What do I want out of my life? What am I grateful for? Just a little bit of reflection like that starts you on the journey.
Deepak Chopra