I have been in several old-growth forests, and they have a special feeling, at least to me. One of them may have been virgin forest, for which one definition is never been logged.
This is not an opinion based question, because I am not asking if others have any special feeling in an old-growth forest. It would be interesting to know, but it would not answer the question.
The question is: Is it known whether human senses can detect any identifying quality of an old-growth forest, and is this backed up by experiment e.g., possible sensitivity to faint smells in old forests? There seems to me to be a quality to the silence. Possibly this is because I know I am in a special forest, not on anything my senses pick up. Let's confine this to temperate forests.