This seems to be an abridgment of all the material found in the Merck Manual home addition of relevance to aging or typical diseases of aging. It is missing some of the detail, and my guess is that there are better books for a more sophisticated older reader, including the Merck Manual itself. It is printed in relatively large type. There is an enormous quantity of common sensical repetition, such as the trope about "people tend to slow down a bit as they age". This mantra is repeated in one form or another every few pages.