Life expectancy of plastic toilet cistern

Hi there,

I wonder whether someone would be able to give me some advice with regards to the life expectancy of a plastic toilet cistern. The guidelines on your website suggest 100 years however it doesn’t suggest what material the toilet cistern would be made from for it to last that long.

Currently we have a toilet cistern that is made out of plastic and is 41 years old. what are your thoughts on this? How long would you estimate a plastic toilet cistern would usually last?