When do you replace something?

When it becomes aesthetically unpleasant?

When it becomes unfunctional?

When a better version comes to the market?

When you save up enough for the better version?

When someone points out and asks: “When are you going to buy a new ___ ?

When you have gotten an arbritary $0.01/$0.10/$1.00/$10.00 per use worth of value out of it?

When it becomes a health hazard?

When it becomes a social standing hazard?

When new science research proves that it is an environmental hazard?

When new social/political research proves that it is an ethical hazard?

When /r/frugal approves?

When you feel like it?