How long would you keep your PSU? Is there a way to che

I've got a old Detla server power 550W from 2007.
It was constantly used for 4 years until I get alternative quieter modular psu.
That Detla psu is now pair with my old PC in living room running Ubuntu for watching video online probably 2-3 times a month.

Please Help.
Thanks !

I didn't find the right solution from the internet.
References:
-https://www.computerforum.com/threads/how-long-would-you-keep-your-psu-is-there-a-way-to-check-health-of-psu.242213/
-3D Promo Video Examples