

You can also use the FreeTube application, that can use Invidious servers internally. The main server of the Invidious network can be accessed by replacing by yewtu.be in the video URL.


All other methods seem to not work anymore. Update: currently the only way to view age-restricted videos seems to be via using the Invidious network. Myself I don't see the need to use youtube-dl at all when sites like this are available. Instead of ?watch=id go to for example ?watch=id (you can download simply by right-clicking on the video), ?watch=id or ?watch=id (with these two, download links are directly on the page). However, there are multiple websites that allow you to view and download such videos without logging in. Looks like youtube-dl doesn't support the latest Youtube changes in age restrictions.
