No. The G5 is the only 64-bit processor that Apple uses. G4s, G3s, 60Xs, and older are 32-bit processors.
That "64-bit data path" is not what you think it is. That defines the number of bits that can be transferred between separate components of the computer, like from the processor to main memory.
A "64-bit processor" in very basic terms is one that treats memory and calculations as 64-bit-long values instead of 32-bit-long values. That means it can calculate much larger numbers without breaking them into smaller chunks and it means it can address a whole lot more memory.
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