[Perdogg]

I am only concerned about how long microsoft intends to support Vista64 with updates.

[oh8eleven]

Yeah, my bad, I saw your OS in the title only after I read it three times. Duh.
If your current PC is handling Vista64 without problems, I'd wait to upgrade.
In fact, I'd wait until you needed a new PC even if it's a few more years.
My experience with MS OSs goes back to the DOS days and I can't recall an upgrade (versus a clean install) that didn't have problems sooner or later.