PS Audio did have some build issues in the past when their gear was assembled in China. My Chinese built Premier Power Plant failed within a year of purchase. PS promptly replaced it. The P5 Power Plant that replaced the Premier is made in the US and was built like a tank as is the P12 that I bought to upgrade from the P5. I see no reason to believe that PS gear has any specific life span.
i just replaced my 31 year old Conrad Johnson PV-12L with a new Backert Labs Rhumba Extreme 1.4. The CJ was not built to the current PS standards but the only work I needed to have done to the CJ was cleaning contacts on the Selector knob.