These two books, from the writers behind the website, provide a deeper look at the principles of lifetime running, and those who have done it successfully for decade after decade.  Both books give lots of advice that you can use to guide your own running. 

From Amby Burfoot. To order an 

autographed copy from Amby for $25 with free shipping, email him
Click below on the title to go to Amazon.
Run Forever: Your Complete Guide to Healthy Lifetime Running

And from Gail Waesche Kislevitz.

Click below on the title to go to Amazon. Running Past Fifty: Advice and Inspiration for Senior Runners (available Oct. 2, 2018)