I can remember my 18th birthday too. I was on a ship refuelling in Curacao and had the wildest taxi trip you could ever imagine from the refueling wharf to Salina Sint Michiel.
It's too many years since I was 18 (32, seeing you ask...) but it's a great birthday to have, so bask in the allure of adulthood and make the most of it (it may pale somewhat, later on!)