Q: Macbook Pro (Mid 09') won't startup in 32 bit mode

I'm afraid you miss the distinction between the 32-bit and 64-bit kernel and 32-bit and 64-bit software. Some old Macs cannot boot the 64-bit kernel, but they will run 64-bit software.

32-bit vs 64-bit Snow Leopard

How to tell if your Intel-based Mac has a 32-bit or 64-bit processor

Mac OS X- 64-bit kernel frequently asked questions

OS X v10.6- Macs that use the 64-bit kernel

OS X- Starting up with the 32-bit or 64-bit kernel

If your computer can boot the 64-bit kernel but will not start up with it by default, then you can make the switch using software such as 32- or 64-bit Kernel Startup Mode Selector

Please post the output of the following shell command:

uname -v

You're running the 32-bit kernel, which is what you seem to want, although it's not clear why.

Why. Your computer runs 32-bit or 64-bit software. It just doesn't boot into the 64-bit kernel by default. Did you read the links I posted for you?

Right now your are booting into the 32-bit kernel.

And, that's perfectly normal since OS X is a 64-bit OS. Note that this has nothing to do with the version of the kernel you are using.

Correct.

The only reason to run the 32-bit kernel is for compatibility with old 32-bit kernel extensions from third-party developers. If you have any of those, you should be looking to get rid of them. If you don't have them, forget it.