My sister-in-law practices physical therapy in Boulder, CO. She sent me a link to her company's website that includes a very good section, "Learn About your Injury": http://www.altatherapies.com/eOrtho/index.php
The writing is very clear and concise. The anatomy graphics are also very good. Plus, for each injury various surgical vs. nonsurgical treatments are discussed.
I am 56. I would be interested in hearing how you older boaters keep fit and healthy.