MC phono cartridge lifespan (when not using)


I have bought a new Benz Wood SL and a few weeks after I have received a new Benz Glider as a gift. I have the Benz Wood mounted on my Ittok and really like the sound....I’d like to know if it is wise the keep a Glider as a spare/replacement when the Wood is worn out....That could be in 5 years or more.....so my question is really....will the Glider sound as it should in 5-10 years or will some parts deteriorate even when not using.... Suspension parts or oxidize coils or any other parts....Or should I simply sell it and buy something else when needed.....I know the Wood sound a bit better but I could live with the Glider as I had one before and loved it....
128x128garylb
Inside room much longer than human can live approximate threshold 
NOS 80s cartridges are solid 
seen 70s cartridges with life left
The glider does a lot of things right. Are they the end all be all, no, but there are not many of those.
I own a Benz Glider and it was great.. for about four years.
Now it is lean sounding. If I play it a long time it gets slightly better than from cold, but not like it used to be. I got about 800 hours out it. So I am not mad.
On the other hand I own a Dynavector Ruby23 which is really old..
Like 40 years old and it still sounds wonderful
Will keep my Glider as a spare or replacement for when my Wood is done...maybe in 5 to 10 years from now they will not be avaiable or too expensive. Hope it sounds as good then?????