I am your same age and as a rule feel good. I opted for a mechanical heart valve because it was supposed to last a lifetime. Because of that I have been on blood thinners. I was just recently diagnosed with a stroke that was heart related. My cardiologist increased my blood thinners, put me on blood pressure medication even though it wasn't out of control and increased my cholesterol medication to try to prevent another stroke. The stroke was found by my neurologist who was following up on my brain. I had a brain tumor which was surgically removed 4 years ago. As a result of that surgery I have balance problems and need to use a cane.
I have recently been diagnosed with 2 aneurysms on my spleen during a routine ctscan. They are small and my vascular surgeon isn't concerned but wants to follow up in a year.