Running Macbook in 64-bit mode

Hi there,
I've just installed Snow Leopard onto my 13" Aluminium MacBook (Late 2008 model), and noticed that my MacBook is still running in 32-bit mode.
How do I change it to 64-bit mode? I've tried holding down the 64 keys and then pressing shutdown but nothing pops up, it just shuts down as normal and is still in 32-bit mode.
Any help is appreciated.
Thanks.

It is normal. The kernel runs on 32-bit mode, but the applications will run on 64-bit.
Running kernel in 64-bit mode is only useful if you have more than 32 GB of RAM. You won't notice any speed improvement running the kernel on 64-bit

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