Hi Doctor. I Am 64 Years And Do A Reasonable

Hi Doctor. I am 64 years and do a reasonable amount of exercise . I find both legs my inner calf muscle pains. When I try to massage also I can find the muscle stuff. Is it age, dehydration or some thing else as I have been having this for over three months. Sometimes my shin bone also pains about 9 inches above the ankle. I have been having knee pain issues for the last three years for which I do daily set of exercises