I like to go to
www.webmd.com for information. They don't seem to have a section on aging, so you will have to look up the illnesses of concern separately. Here's a link to the alzheimer's section.
http://www.webmd.com/alzheimers/default.htm I am very happy to hear that you are doing this research with the intent to improve your health! It's very a very positive thing to do and we all should be so proactive!!