Many mountain ranges are surprisingly young, geologically speaking. They rise quickly, but also erode rapidly. The tallest ranges (Himalaya, Andes) are relatively young, at roughly 20--50 mya based on a quick Wikipedia read.

The higher and more rugged the range, the younger, in all likelihood.

Certainly not all, e.g. trees are ~8x older than the Himalayas. I think trees might actually even be slightly older than the Central Pangean Mountains.

I suspect gp may have been referring to specific mountains and specific trees, not trees as a species.

Correct.

No, they were referring to trees in general. As in, this particular mountain range has existed since before the first tree evolved on earth.

Edit: My mistake, thought you were referring to the original “older than trees” comment.

hprotagonist was