The central Proceesing Unit of the computer is the part of the computer which interprets and executes instructions. It is sort of like the brain of your computer. The speed of the processor really does depend on its age. Newer models of processors have more advanced technolachy making them faster and stronger.
The speed can also depnd on how much data has been absorbed into the computer e.g. douments. This is because whenever you have a lot of files on your coomputer, it may take longer for all of them to be precessed and load up onto your computer. 
Memory--The memory of the computer (also can be known as RAM- Random Access Memory) is your part of the computer which stores all of files. It holds all your documents, your internet browser, your games etc.
Your computer will come with a built in RAM enabling you to save all of your work but if you run out of room, you are then able to buy additional RAM packages from computer shops or online.
Just like the human mind, if you did not have memory on your computer, it would not be able to save any of your files for you to use at a later date. It is an extremely important part of the computer.
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