A quality PSU can often last 10 years and multiple builds. Quality in this case just means "has things like over voltage protection, proper wiring included, decent caps, and decent voltage regulation" not "was really expensive". E.g. that $140 85 W Seasonic Focus tier is quality in this regard, the $80 no-name 850 W PSU is what people warn about, and the $400 Seasonic Prime titanium rated PSU is mostly for those scrutinizing VRM designs or wattage limits on the cables to the GPU for their overclock goals.
It's common to upgrade your PSU anyways though as it seems like parts wattages only go up over the years (particularly for the +12v rails) or one may want to cycle out the old system completely for reuse/resale. Generic advice (since most people buy cheapo no name PSUs and upgrade rarely) might be to say to replace just to be on the good side of every situation... but if you're one that knows you got a quality PSU or likes to upgrade your build every other CPU generation, then swapping out the PSU every time is likely a waste.
It's common to upgrade your PSU anyways though as it seems like parts wattages only go up over the years (particularly for the +12v rails) or one may want to cycle out the old system completely for reuse/resale. Generic advice (since most people buy cheapo no name PSUs and upgrade rarely) might be to say to replace just to be on the good side of every situation... but if you're one that knows you got a quality PSU or likes to upgrade your build every other CPU generation, then swapping out the PSU every time is likely a waste.