|Unless it's a really cheap laptop made by a company nobody has heard of, the touchpad should last for years. In fact I never heard of a touchpad going faulty through wear-and-tear. My Acer laptop is six years old, I use it every day and the touchpad is fine.|
Are you sure it isn't caused by driver corruption? Re-install the touchpad driver and see if that fixes it. You can download the driver from the laptop manufacturer's website (if they have a support website of course, some cheap brands don't have one).
If new driver doesn't fix it, just buy a compact USB mouse which is easier to manipulate than a touchpad anyway in my opinion.