boom, the right stantion anchor broke and down came the mast.
The word "stantion" may be refering to the pylon post that holds up the trampoline frame? These are aluminum and they will corrode over time at varying rates due to water types and weather conditions.
Or, are you talking about the "shroud wire" anchor? The stainless pin that is bolted to the lip of the hull? These can be cracked and show rust inside. One more item that should be inspected before sailing.
With boats getting really old... some over 30 years old... these types of problems will become more common.