I would buy a cooling pad.
They're usually near $20.
They have small USB powered fans that cool your laptop.
You just place your laptop on top and put the cooling pad on your lap.
Plug it into your laptop and use.
My laptop handled Maplestory, Google Chrome, and Minecraft for 8 Hours with a shitty 2 fan $20 pad.
My laptop is 4 years old too (family laptop).