You lads have done well to get that much use out of floating lines.
Bank fishing small stillwaters, particularly gravel pits and specially in the winter, is a good way to kn*ck*r floating lines inside 18 months, the abrasive effect of the mud and sand does for the line even if you clean it regularly.
My record for long fly line life was a "home made sink tip shooting head" bought from Bob Church's shop when he had a share in one, in about 1978. It was used regularly on reservoirs - I did try to look after it. I got over 20 years use and many Farmoor, Sutton Bingham, Eyebrook and Bristol reservoirs trout out of the line, but eventually all the plasticiser leached out and it went too stiff to use any more (oooh err

)
Bye bye old friend - Steve Parton custom made a new one for me, which gets an airing from time to time on ressies.