A stylus last about 2000-3000 hours according to the makers.That said,if parts other than moving parts age too,why do they design and supply replacement styli?To rip us off?If you take 2500 hours and divide it by 18 months,it would take at least 4.5 hours of listening everyday to wear it out.Is it their intention to rip us off,(I doubt it)or do they still not know you shouldn't put a new stylus in your over 18 month old cartridge?Just curious.♫