Code:
on *@:join:#: {
  if ($chan == #chat18+) {
    if ($nick == moo) { .msg moo Hello $nick $+ , you are moo. }
    elseif ($nick == foo) { .msg $nick hello $nick $+ , you aren't moo. }
    elseif ($nick == boo) { .msg $nick hello $nick $+ , you aren't foo or moo. }
    else {
      .msg $nick Hello $nick $+ , Welcome to $chan $+ . May we have your age Please ?
    }
  }
}

try this one then, tested and working for me, make sure you don't have any other on *:join: abow this code.

if ($me != tired) { return } | else { echo -a Get a pot of coffee now $+($me,.) }