I'm running a AN650K3 (2003) and a AN650K7 (2007) Executives both of which I purchased used, and neither of them have had fuel lines replaced. In all the 20+ motorcycles/scoots I have owned since the mid eighties I've never heard of replaced fuel lines. I'd expect to read "replace fuel filter" before I'd anticipate "replace fuel line"... Even my 1968 Pontiac Perisienne had the original fuel lines right up until I sold it ~15 years ago.
Guess from that it's a pretty safe bet that the fuel line is not a item swapped out that often, and not something I'd be concerned about unless there was an obvious need, like, being located some place where poor fuel quality was the norm...
Not a bad idea to have new ones on hand, before you take apart an old bike, as when they get old they crumble when you mess with them. Then again stocking parts may be overkill. I have a bundle of polyurethane fuel line in a drawer just in case.
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