Ball death, as it is called, does exist. Thing is, much of when it happens depends on the user and their maintenance regimen.
If you use the ball often, clean it only sometimes, never refurbish the surface, etc, etc, etc...., you are going to suffer from a much shorter lifespan.
If you use the ball regularly, ALWAYS clean it immediately after use, have the surface freshened after 30-40 games, and rejuvenated after every 75-100 games, your ball is going to last much longer.
ALL BALLS SUFFER LOSSES IN PERFORMANCE LEVELS, no matter what you do, but you CAN extend those useable periods greatly by doing regular maintenance.
I know guys here who are still using 5,6,7 year old, and older, balls that work fine.