What is the average liftetime of a pool liner? I have a 25 mil liner that is about 8 years old. I havent noticed any issue with the liner other than the sun fade.

I have to drain my pool all the way. I am just wondering if i should replace the liner while i have the pool empty. I dont want to fill it back up and the liner fail in a year or 2 and have to go through draining it all over again.