Most age related illnesses, diseases and pain come from inflammation, both local and systemic. So natural anti-inflammatories are what you want to look at. Salmon is one of the best because Omega 3 is anti-inflammatory and Salmon also is a good source of protein. Look into other proven natural anti-inflammatories as opposed to NSAID drugs like ibuprofen to control inflammation. Add moderate aerobics also, as it activates anti-inflammatory things like AMPK, a major anti-aging substance in the body. The other thing that fights aging is reducing refined carbs and sugar. Older age is a good time to lower high glycemic carbs and even lower carbs in general. It's a balancing act as you get older, because inflammation is also what builds muscle as a response to muscle damage from heavy lifting. But focus on natural foods and nutrients that fight inflammation. Read Jerry Brainum's work on the subject, he has researched bodybuilding and health over 50 more than anyone else.