When should i replace my clutch?

I have a 95 Mitsubishi Mighty Max and didn't changed the clutch for 13 years when is the best time to do it?
When should i replace my clutch?
You just keep going with it until it slips and burns out, there isn't really any hard and fast rules regarding it, all very dependant though on how the driver uses the clutch, if you don't ride the pedal or abuse it in any way then in can last x amount of miles. The only time you change a clutch before it's slipping is if you need to remove the transmission for any reason, you do it then as a matter of course.
When should i replace my clutch?
Basically when you wear it out enough and it doesn't %26quot;catch%26quot; anymore. Could cost alot, but if you take car of your car, a manual is better in many different ways.
when it starts slipping no point in changing it until it gives trouble