Please post example URLs and a log.
@Spellbound
If you have a static IP you can only use proxies or a VPN.
Keep in mind that if Google recognizes e.g. VPN usage, you will probably get even tighter limits!
Regarding the "Confirm your age" error:
Please keep in mind that while you are maybe logged-in via browser, JD is not necessarily logged-in and thus is not allowed to watch 18+ videos
You need to add your youtube/google account to JDownloader to be able to download such videos.
-psp-