I Had Artery Bypass In 2010. 2 Arteries. I Was

I had artery bypass in 2010. 2 arteries. I was told in 2016 I had a major artery and 3 or 4 others blocked. I chose not to have another open heart bypass. I am 78. It has been 28 months since the last diagnosis and I breathe hard when up and walking. How long do you believe I will live
and will I have a stroke or heart attack ?