explain why a 30year old plane canīt have age issues?
could it be because the engine is what failed and the engine and the plane have only been together for a few months.
OTOH, give us a hint of what you mean by an age issue
The design itself has been around for a long enough time to have numerous Service Bulletins and maintenance updates applied to it. If the engine carcass (original data plate) is old I bet the parts are not.
To me the issue is the last maintenance and what Service Bulletins were complied at that time.