I think that’s a problem with using the average age for everything. A bunch of people think their lives peaked in High School and a bunch of other people think it was in their late 20s/early 30s, which averages out to 23. But I suspect almost no one thinks the peak of their life was age 23. Median would be a more appropriate measure here.
As long as you’re using just the pihole YouTube shouldn’t be able to detect it. The playback blocker is based on detecting common ad blocker extensions in your web browser.