I too, have had fuel lines last 25+ yrs in the Sears, which are (Poulan) saws and weed eaters, before the ethanol days.
I use non ethanol and Stabil in everything, except my zero, I never leave fuel in anything for an extended period.
The Kawasaki has a single rubber line and has never been a problem, it holds 11 gals and too much problem to drain in the winter.
I find the clear colored fuel lines seem to hold up better than the yellow ones.
Here on the coast, most outboards are Yamaha, locals have found out, if they stay away from ethanol, they have less problems, in both 2 and 4 strokes.