It is not this thread that causes me any concern , it is a personal opinion that you would get more feedback if you presented yourself as a novice first and grow into the role of Mr Tiler.
As for this thread - IMHO tiles have a shelf life but not in the way of a food item ! Fashion and trends dictate how long a style of tile will stay in vogue and for how long. Terracotta had a renaissance for about 12 years towards the end of the 80s and well into the 90s, until it became popular and people ruined it with poor fixing techniques. And I fixed a particularly hard floor tile in a Cafe only for it to last 20 years as the clientele were cyclists with steel toecaps!
So as they say - there may be no such thing as a stupid question , but perhaps you may need to explain your question at bit in the original post .
Good luck with your quest to become the best tiler around - you might make it - but it will be down to you!