How Often To Replace Bike Saddle?

How Often To Replace Bike Saddle? “For an amateur rider, we suggest a saddle change every 15,000-20,000km (9,300-12,400 miles). This doesn’t mean the saddle is not usable after this distance, but the performance of the padding and the shell will start to deteriorate.” How long do Chainsets last? Chainsets should last lots more than 4000