Welcome to the forums.Sure there is a higher probability just like anything. How about a TV that is over 5 years old? Would you stop using it because of the age of the power supply? What about a stereo? No, you wouldn't even though they generally use far more inferior components than that Seasonic unit. No normal person would. It is a bit insane to have a "replace it now" attitude. What about vintage computers or those in industrial applications that have 10-20+ years of usage? Those power supplies are used all of the time. The warranty is not a shelf life nor is it an indicator of the lifespan of the unit. It is how long they will cover it if it fails. That's all. If it has been well maintained the power supply is completely fine to use and it's poor advice to suggest to someone that they should replace a unit just because it is outside of a warranty period.
you joined to reply to my comment I feel it fair to rebut.
the TV analogy is flawed, the TV does not change the power draw over time like adding a new GPU with twice the draw of the current. if you could swap out panels and you needed more power to drive it I would suggest replacing the panel and the PSU in the TV.
a stereo, likewise has a set power requirement and the AMP will not suddenly go from 100W to 300W without needing more power.
you go to the auto shop and they see the battery is low on fluid and crystals are forming, yet it still works, do you replace it now before failure or wait until your on a deserted highway in the middle of nowhere needing a new battery before you admit the battery is an issue and that failure was imminent?
preventative maintenance is all we are suggesting here, because we have seen it, read about it and helped others with this exact same concern. we have seen what happens when people cheap out, especially over a PSU to get 2 more cores or the next class GPU, and we have seen the many who learned through entire system replacement the PSU is not the place to skimp.
the warranty is an indicator of how long it will last from the people who designed it. is it exact? no. is it a good guidepost? yes.
there is a reason the EVGA 500B has a short warranty and the EVGA supernova G2 has a decade. its not marketing, its the quality and design of the unit.
how do you maintain a chemical reaction without replacing the chemicals? a capacitor is a chemical device and reactions therein are limited. you replace the unit and the chemical capacitors, which unless I missed something is exactly what we are suggesting and you are railing against. routine maintenance.
I only offer advice based on my experiences. feel free to disregard. call me insane. what have you.
Please do not tell others a PSU will last forever, that is insanity.
I work on windows 95 systems (assembly line automation controllers) still today and you know what, they have shiny new PSU's, that is the only reason the decades old computer still function. those old machines are nigh impossible to replace affordably and keeping them running is more important that an occasional PSU swap.