They have a special right now where you can enjoy one liter of beer for FREE on your 21st birthday! I suggest taking advantage of this deal! Also, be sure to participate in the festivities while you're there.
I had come to Hofbräuhaus on one of my "21st" birthdays and had a blast, this was definitely one of my most unforgettable birthdays. Just thinking about the first time I had their beer brings a smile to my face :)
If you didn't know, Hofbräuhaus Las Vegas is the first German/Bavarian beer hall and restaurant in Las Vegas. This faithful reproduction of the world’s most famous beer hall, the original, centuries-old Hofbräuhaus in Munich, Germany, is an authentic and entertaining blend of tradition and fun.