When I was 51 I got diagnosed with a congenital heart issue that had been taking out a number of male members on my father's side of the family for years. At the time they had only recently discovered what it was and what we had thought were relatives dying of sudden heart attacks was mostly likely due to this instead. My doctor had thought I had a heart murmur for some time and after a while thought it prudent to have an echocardiogram. The results of this test led to several days at the Mayo Clinic where they came up with the diagnosis. Long story short, it meant that the disease could kill me at pretty much any moment, but was somewhat manageable with regular heart checkups and medication. The nature of the disease is such that the only effective cure has to wait until the disease progresses until a certain point and only then can a surgical intervention be performed. The trick is not die until it reaches that point. It's now been 14 years since that diagnosis and I still have not reached that point. On the good side, during my last echocardiogram, the technician asked if I had had the surgical intervention as there was no obvious sign of the condition. It turns out I have gone into a remission of sorts, but as their knowledge of this condition is so relatively new, there is still quite a bit they don't know about it.
Anyway, for the past 14 years I've lived with the idea that each day could be my last. I have since come to understand that remains true for all of us, I've just had to be more conscious of it. Consequently, my focus has shifted to placing a higher priority on doing some things sooner than later, such as personal relationships and letting those who matter to me know how I feel about them.. Sadly, it played a role in my getting divorced, as my ex-wife's father had lived most of his life with a bad heart condition, dying from complications of of it I his 50's. She told me she didn't want to end up like her mother and caring for a dying man for years. There were other things involved, of course, but it was a contributing factor and it's now been over 10 years and I've managed fine without her. Funny thing is, the guy she married after we divorced has now developed some serious health issues of his own while I keep chugging along.
Anyway, the point of this that I wanted to make, is that sometimes knowing you may not live all that much longer can cause you to make more out of each day than you otherwise might not have. I know it changed my outlook for the better and my life has been fuller because of it.