I agree with rod_r, also my Superfreak looks new after some time of use. But also my older HSM Stealth looks great after many years of use, especially the 8,5 from 1999, that I've used really a lot of time like main sail in Venice from 2003! And still looks great even if monofilm "sounds" loud when rigging.
Yes care matters, but monofilm/sailcloth quality and sail shape can change a lot the things. I've had bad experience in the past with a Neil Pryde Ultralight 7,9, nice "wing shape" but a lot of mast curve (luff 547!) and tension and monofilm started tearing after 2-3 years.