I don't believe that brake lines last forever. There is still a Teflon core and Kevlar sheath beneath the stainless braiding, all these can break down over time, especially given the neglect that some owners show their brake fluid.
One thing I've noticed on several of the used Gas Gas ECs I've bought over the years is the way the cable ends up routed tends to make the brake line kink about halfway up the fork. I just had to replace a line because it kept kinking and collapsing at that spot. Improved the feel dramatically.
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