aluminium frames expiry date?

Here is a technical motorcycle question that doesn't (with the mostl````````````````y steel trellis frame) really apply to the Superduke, but I thought someone here might know the answer anyway. I read this in the Nov. 2001 issue of the British Magazine Classic Bike Guide, p. 37.

"As I understand it, aluminium alloys have a finite and relatively short life expectancy even when subjected to normal stresses: i.e. when they get old. they break. In the pushbike world again, an authoritative source speculated that an aluminium frame was only designed to last as long as it stayed in fashion! Motorcyclists are less expendable and more litigous, so lets hope that the same doesn't apply to all those early Suzuki GSX-Rs now being snapped up...and ridden on cheap classic insurance. perhaps a metallurgist out there can enlighten us?"

Is there any truth to this?

No - aluminium frames will not expire within the expected lifetime of a bike.

Aluminium alloys are used in airplanes with expected lifetime of 50+ years. (even back in the sixties)

Aluminium alloys have been around for many years (60+) and I'm sure that even 30 year old bikes with aluminium frames will last many more years

Really , back when I was a workin track when all those "new" Suzuki GXSR things were a breakin frames right and left, If I remember right, some at the steering head and cracking down by the swingarm pivot area, usualy after a crash, but it was a real pain in the "A" to clear the track of that crap,( had to drag em off),,,,"lawn chair chassis" people were calling them,,,,,,Suzuki fixed the problem however,, but still, today I would think if you hit something hard enough it could still crack in half,(Honda had probs with the "honeycomb RC30 chassis too),,it's not steel after all,,,,,,if however I was buying a used bike with a ali chassis I would seriously ckeck out all the frame weld joints for cracks and such just to be sure, and it all would depend on what kind of life the thing had,,,