This is a strange question. Bombadil was First in Ea, but that does not, I think, include forests and landscapes. Fangorn Forest may have been around before Bombadil, but there were no sentient peoples before Bombadil.
As for Treebeard, I do not think he was ever in Valinor. He was created long after the Ainur descended on Ea, so Bombadil is certainly older than him. But, again, I am not sure the exact meaning of your question.
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...where the instrument of intelligence is added to brute power and evil will, mankind is powerless in its own defence.
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