Trees and flower were creatd before the elves right? Maybe the first elves awoke a tree into tree-beard. So in one may he is older then the elves, and in another not. In any case, no now living elf is as old as him.
I agree that Bombadil is like outside everything, he doesn't connect with any other stories. I've heard someone suggesting he should be the reader of the book. So I can agrre with treebeard as the oldest in Arda, even if Bombadil existed before him.
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And with that he lifted high his sword and flames ran down the blade
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