In this wonderful book (a must!), Deepak Chopra explains in a very understandable way and from A to Z, the difference between growing old and growing sick, being the last one, the accepted condition in our Western cultures for anyone over 45 years old, but amazingly, this does not have to be... it's actually a matter of awareness! biological age depends on psychological age he says, implying that knowledge of true nature is essential to overcome the fear and sorrow feelings that are really responsible for our cells' inability at a certain point of age (beginning at around 30 years old) to rejuvenate themselves; "the habit of fear has sunk so deep that the body remembers to carry it out, even when the mind is resisting with all its might".
We are not these bodies, but the thoughts that create it and those ones come from the Field... and it is right here where this book grows interesting; unity is what we should always aim for. Our physical world and our inner world (quantum) are closely related, forming the unity that gives consistency to the world we perceive, but perception is reality and ours is conditioned to think we are trapped in time and space so, we grow old and die because we expect that. We interpret that as the end, while it is really transformation. The moment we understand that the nature of our awareness is timeless, this process of growing old can stop and even reverse. It's our unique capacity of consciousness among all living creatures, which gives us this possibility.
After reading this book, I can also see, that in a couple hundred years from now, many aspects of our Western, modern medicine, will be seen as not very different to that from the middle ages in our eyes today... a wonderful read that will give you a completely different view of life, death, health, sickness, aging, healing and eternity. A tool, more than a book.