The National Commission of Science for Sustainable Forestry concluded that 3.5 million acres (or six percent) of the PNW's 56.8 million acres of forestland qualified as "old growth"—that is, largely trees over 30 inches in diameter with complex forest canopies.

https://www.scientificamerican.com/article/are-old-growth-forests/

If it ain't "Old Growth" by that definition--which is pretty broad--and it's growing in the Oregon mountains, it was probably re-planted by either the USFS or some "private" entity. 

Replanting creates unnatural agglomerations of trees, or "tree plantations", which are valued as a commercial raw material, but which lacks many of the defining characteristics of an actual forest, including the " the complex forest canopy" the USFS identifies.

I'm sorry if you've never heard that term before, CBD, but it is common parlance in this topic. Of course, you only see what you want to see anyhow. That's common among addicts, poor things.