Unfortunately, chronological age is not a good gauge to go by.
Many products now have a designed in EOL (End of Life) that determines how long a product may last. Heavy use only shortens the life span.
And very likely that you, as have many people, have likewise experienced some product failure just after the warranty runs out....
Before buying - start here:
https://www.tomshardware.com/reviews/best-psus,4229.html
Use two or three of the calculators to size the wattage requirements.
Do your own manual calculation as well. If a component has a wattage range - use the high end wattage value. Once totaled - add 25% or so.
Key is to reach a consensus on the wattage requirements of the host system. Then purchase accordingly.