My friend is father is having quadruple bypass surgery on Tuesday.He is 80.My father had the same,but when he was 65.Is it much more risky the older one gets?

It can be. It depends if they do it what they call of do it offf bypass, or on the bypass machine. If they do it off bypass his chances are definitly going to improve
Also there is a possilibity they can do the sugery through the ribs without openng the chest.