I was astonished to see in my latest flyer from 'Music Direct' the followings statement:
'A phono cartridge only lasts for five years' and then ' a good rule of thumb is to replace your cartridge at least every five years!!'
Further the piece states: ' All the tiny parts inside your phono cartridge oxidize over time, no matter how many hours you put on it.'
Now I know that they are trying to sell cartridges, BUT how many of you think these statements are correct?

Dear DaveyF: That quote from MD is a little " confuse ". If you use your cartridge 4-5 hours every single day then maybe the cartridge/stylus could be with you even less than five years, maybe two years! and if you don't take care about like cleaning your records and stylus maybe that cartridge could last for no more than a year.
There is no doubt that even if the cartridge is with out no use it deteriorated in different ways but not as " dramatic " as some of you posted.
Right now I'm enjoying a MI cartridge build/designed in 1964 yes you read well: 1964!, this is 46 years ago that was builded. The cartridge specs say that VTF has to be at 0.5-0.7grs, well after all those 46 years the cartridge can't performs fine at that VTF due that its suspension " suffer " a degradation through the years but still performs great between its VTF range ( high limit. ) and I really mean it: performs GREAT like if the cartridge was build "just yesterday.
The more critical problem with cartridges reside in its suspension that is the area where more easy " suffer " a time degradation.
Even that a well cared cartridge can be with you before stylus goes ( for time playing. ) for many many years, a lot more than MD 5 years statement. IMHO 20 years could be a good average.
I own 100+ cartridges several with more than 25-30 years that were builded and today perform at the same level and even beat several today/fresh top cartridges.
You can read about on this link
http://www.whatsbestforum.com/showthread.php?1260-Best-Phono-Cartridges-Ever-Made . This cartridge is very old and is a great great one, at the end of the review there is a link ( the last of three links. ) where you can find other reviews on very old cartridges that today still are worth to have it and worth to hear it.
Nothing last for ever but if we take care on the right cartridge set-up, cleaning LP's along the cartridge stylus and we have no " accidents " with then we can enjoy the cartridge for many many years.
I think that more than a cartridge degradation because of time we will change our cartridge way before five years due that every year comes " new kids on the block " that reviewers always say are better.
I learn and I don't buy any new " kid on the block " because if it is true that¿'s " new " almost all those " new " cartridges are only different but almost never better.
Anyway, take care on your cartridge and enjoy it till you want to hear something " different ".
regards and enjoy the music,
raul.