>>1855015You don't seem to understand.
Under a certain threshold, steel doesn't experience fatigue, So, if you use it and conserve it properly, your 120 years old steel frame will be the same.
This is DEFINITELY not the case for aluminum. You can use it and conserve it properly, IT WILL NOT LAST.
I'm sorry, but your (and mine too), aluminum frame is going to last a certain amount of cycles. And it is not an hypothetical number, it's a very real number, measurable in a few years of usage, provided NOTHING bad happens to your frame.
There is plenty of people with aluminum frame bike, who, after 4, 5, 6 years, discover cracks on their stays, and they have no idea how it happened, they think it's a manufacturing defect. But no, it's simply that they have run out of stress loading cycles for their alu frame.