How old do you have to be to attend a WWE event in MSG?

I've been to 13 wwe events over the years since 2008 including Wrestlemania 27 in Atlanta, and I plan on going to Survivor Series this thanksgiving break but I heard somewhere you have to be 21 to go to Madison Square Garden and I'm only 17! can someone and tell me if that's true? I was planning on attending it by myself but now I might not be able to!