If you would be heartbroken if it breaks, then I would hang it up on the wall now. That bow is over 40yrs old. It has made it this long and probably will make it for a long while more but no one can tell you when or if it will break. Sometinmes, it just happens. I've shot bows with the little crackly marks at the fadeouts and not had one break. I've shot other bows that no indication of anything wrong and had them break. So , If you want to hunt with it, that is cool, but you have to accept the fact that it might break at some point. If you can't accept that risk then hang it on the wall now.
Bisch