Good thoughts and wishes coming your way. My stepfather had a bypass around that age and he is now 10 years older, works out four or five times a week and living a full and healthy life. I hope your brother has a similar outcome.
For you to be here now, trillions of drifting atoms had somehow to assemble in an intricate and intriguingly obliging manner to create you. It's an arrangement so specialized and particular that it has never been tried before and will only exist this once.
--Bill Bryson, "A Short History of Nearly Everything"