at what point do you replace your PSU on your PC?

This is not a specific question but rather a personal opinion question.

At what point would you replace the PSU on a gaming, mining, video editing, etc., PC?

When the warranty expires?
When you get the itch to get a new PSU?
A new PC build?
When the PSU shows signs of age?
After X amount of years?
When the PSU dies?
New tech/features in PSU market?
any other reason...

at what point do you replace your PSU on your PC?