It's just another birthday, after all. No, it means freedom. Eighteen means being old enough to drive, and finally being in control. It stands for becoming a person - someone of importance, and no longer 'just a kid'. Being eighteen means being able to vote.
Voting means being, to some extent, responsible for whoever is up there in Delhi, creating chaos.
Eighteen means being given your own set of keys to the front door of the house. This means that you are now officially an adult, able to come and go as you please. Of course, that still doesn't mean your parents won't wait up for you and chew you out for coming home late, but then, becoming an adult has nothing to do with being scolded by your parents. But if eighteen means parties and celebrations, drivers' licenses, and the right to swagger into the local pub, it also means responsibility and adulthood. It means being in charge, and in control, but sometimes it seems so much easier to let someone else, like your parents, do all the leading.