Twenty-one is an incredible milestone for many reasons – it’s the first step into adulthood, with all its privileges and responsibilities, and the first opportunity to really make a mark on the world. It’s hard to pinpoint all the reasons why 21st birthdays are so special, but we know just how exceptional this unforgettable day is for your loved ones. To help you put your feelings into words and share in the excitement and joy of this special day, our writers here at Styiens have put together a selection of thoughtfully written happy 21st birthday messages, wishes, and quotes for you to choose from. Browse through our selection of birthday messages and find the perfect one to celebrate the 21st birthday of a friend, partner, son, daughter, or anyone in between. Use our category tags to filter wishes by tone, length, and recipient, or try our site-wide search function to find specific words or phrases. Our happy 21st birthday wishes are perfect to use as they are, or built upon for a longer and more personalized birthday wish. No matter how you choose to use them, every 21st birthday wish you’ll find here at Styiens is a surefire way to bring a smile to the face of the happy birthday guy or gal on their big day!