More common is to deep clean the laptop (open and dust out with canned air, replace failed fans) and then get the owner on a 1st o the month canned air to the vent schedule. The paste is replaced if there are symptoms or reasons. Just a number of years is not why I do this.
Hey guys my notebook just 3 years old and i am thinking about replacing thermal paste to new one. But is that necessary to place it with new one ?
And how long does thermal paste last ?
Sorry for my english and thanks in advance.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic