How old is your cartridge?

Any decent engineer knows that rubber deteriorates with time either through chain hardening or chain scission. That is real world 

Zavato funny!

Zavato, so you change out you motor and transmission mounts on your care every 3 years? 
Strut and shock mounts?

As an ME I think you are full of da ....

With my SOTA Sapphire turntable and Premier FT3 arm, I still use a Monster Cable Alpha Genesis 1000 MC cartridge — its output feeding into a McCormack Phono Drive preamp.  I purchased this cartridge in the late 1980s, and, at that time, it was a “leading edge” moving coil cartridge.

Audiophiles normally have many cartridges, an old cartridge can be almost unused if a person have 15 more cartridges in rotation (for example). 

Cartridge can be stored for decades properly, it depends who is the owner. 

I have personal experience with more than 60 different cartridges, most of them are NOS or like new (and very rare), my experience is very positive with 99% of them. 

You can buy a new stylus replacement for your Shure, this is not a rare model (so you can find an original stylus). 

You can also buy a JICO SAS replacement for Shure cartridge! 

But any stylus profile (diamond) have their own life span, this much more important that a cartridge age. If you stylus is worn you must replace it. 

Check your cartridge and if you're not happy with the sound (or there are some problems) you can search for JICO SAS or Original Shure replacement, your cartridge can be inspected by pro for about $30-40 under a microscope.