Surge Protector Life Span
Surge protectors do eventually go bad, this website says to replace after 3-5 years : https://thewirecutter.com/reviews/best-surge-protector/

You can also see if there is some sort of brand name on the strip and look it up to see if it has a time limit. 

This website also gives some information including that 10 years is too long to go. It mentions that it is hard to know when a surge protector goes bad, so its better to replace them. 

https://www.howtogeek.com/212375/why-and-when-you-need-to-replace-your-surge-protector/