That was the original intent. Too bad you could not even understand. Moving goalposts....my ***
You asked how future civilizations would judge "our age." You asked "In this day & age of..."
In other words, you asked how future civilizations would find evidence of today's technology. I gave you the answer, and then you changed the question to ask how they would find evidence of some future technology that doesn't exist yet. That's moving the goal posts. If your intent was to ask how future generations would be judged when their technology is less permanent, then you should have asked that question instead.
But to answer your new question, you have to remember that biodegradable materials only degrade when they are exposed to the elements that make them do so. If they're not, then they don't. That's why, for example, centuries-old wooden ships that have sunk in certain areas are still in relatively good shape. In the event that a future civilization gets wiped out, there's always a good chance that at least a few examples of their biodegradable technology would become entrapped in something that protects them from the elements, even if unintentionally.
Also, it's likely that future generations will continue to intentionally leave lasting records and examples of their development like we do now with museum exhibits, time capsules, and so on.
So, there might not be enough evidence to get an exact picture, but there will probably be enough to get a pretty good idea.