You are 65 years, you need to understand that these rib and if other bony pains you have can be dangerous.
This type of pain can be becuase of simply a contochondirtis, muscle spasm... but at your age it can be due to some malignancy like multiple myeloma
Or it can be due to some bone fractures as a result of osteoporosis
of old age..
My sincere advise to you is to get a chest x ray
, ionized calcium level, vitamin d3
levels, hameogram with ESR.
Its always better to be sure.
Dr Anshul, MD