If the laptop is 6 years old, and overheating, consider replacing the assuredly crispy thermally conductive pad sandwiched under the heatsink with some actual thermal joint compound.
It has been discussed previously in this thread.
Yes, I've read about this a lot and seen it before myself as well. It's a common problem in laptops. At some point, not even removing the bottom of the laptop and blasting it with air ducted from the refrigerator will help. On top of your CPU is a heat sink that pulls heat away, cooling the CPU (true of any computer, laptop or otherwise). In between the CPU is thermal compound of some kind. The good stuff comes in a little syringe and
takes a small amount of care to apply properly but is effective and lasts for years. For whatever reason, laptops are often assembled with thermal
pads, which are cheap trash and will dry out after a few years. At that point, it's nearly as bad as having no thermal compound, which means your laptop might well overheat enough that it crashes just sitting on the desktop. Fortunately, it's not
too hard to apply thermal paste. Just make sure you remove all the old thermal material first, usually with a Q-tip and high purity rubbing alcohol/isopropyl alcohol (I've also used glasses wipes). Disassembling laptops can be a pain, there's a lot of small screws, but if you find the exact model number you can find a maintenance manual online (not the user manual) that will help, or maybe even a video.