I'd guess it's an ATX so you'd need to buy a mini or micro ATX motherboard that matches the CPU socket to buy a smaller case.
Then remove the CPU, GPU, drives, etc, etc from the old computer and use them to build the new one.
Or just buy or build a new small form computer with up to date components (which for a 6 year old PC is what I'd do).
@Mr_Sworld started
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I'd guess it's an ATX so you'd need to buy a mini or micro ATX motherboard that matches the CPU socket to buy a smaller case.
Then remove the CPU, GPU, drives, etc, etc from the old computer and use them to build the new one.
Or just buy or build a new small form computer with up to date components (which for a 6 year old PC is what I'd do).