Am I Old or is my 1st born getting big

I can' believe it that I said yes.  My first born is 11 and a half he is going to the movies today with a friend to see Wolfman.  They are getting dropped off by his friends mother.  He just asked me if he can go get a slice a pizza afterwards at the pizza place a few doors down.  I said yes.  Am I crazy?  Is this the age I have to start letting go?  The movie theatre is only about 8 blocks from my house (in walking distance) Whats next  hanging out at the mall?  NOT!!