117 Captions for Instagram to Celebrate Your 21st Birthday – Parties, Friends, and Cuteness Galore!

Birthdays are always a special occasion. And when it’s your 21st birthday, it’s an even bigger deal! After all, you’re officially an adult now.

So, if you’re looking for the best 21st birthday captions for Instagram, we’ve got you covered. From funny and sarcastic to sweet and sentimental, we’ve got a caption for every type of birthday mood.

And since your friends and family will be flooding your feed with birthday wishes, make sure to stand out with a clever or funny caption of your own. After all, it’s your birthday!

So, without further ado, here are the best 21st-birthday Instagram captions:

21st Birthday Captions

1. Finally turning (5 x 4 + 1) today!
2. 21? It’s just the same as any age.
3. I’m still a teen. Two plus nineteen.
4. Happy 21st birthday to me~
5. Who’s legal now?
6. Officially twenty-fun years old!
7. Cheers to all the fun at twenty one!
8. Shall we celebrate me today?
9. Twenty one shouts adulthood loudly at my ears.
10. Let’s enjoy my first day as an adult~
11. Toast to the kid no more.
12. Level update: 21!
13. Pass me the booze please~
14. Welcome to the most fun age of the lifetime!
15. Did someone just turn 21? Oh, wait, it’s me.
16. Although the bars are unaware that I have been 21 for the past three years, I suppose I can finally celebrate it. I made it to 21; cheers!
17. Been writing a book my whole life and now I’m at my 21st chapter.
18. We’re only twenty-one once.
19. They say I should act my age. How would I know that? It’s my first time in this age today.
20. I’m feelin’ it, 21!
21. Hoping for a brighter future for this twenty one-year-old person right here.
22. Surely  my 20th year was rough. Thank goodness I’m now 21.
23. Looking forward to dreams and aspirations coming true this year.
24. Age: 21
25. Summoning my inner booze drinker this year.

21st Birthday Instagram Captions

26. Twenty one and breathing.
27. Now give me a cake with 21 candles!
28. An official adult with a 5-year-old brain.
29. Can the world stop turning? I wanna stay 21 forever.
30. Forever 21?
31. Congratulations to my mom who put up with my naughty head for 21 years.
32. Turned a year older and a little wiser, maybe?
33. Are you serious? I have been existing in this world 21 years now?
34. On this day twenty one years ago, ang angel has been born.
35. Am I going to have a hard time adjusting to adulthood?
36. Been preparing for 20 years just for today.
37. All I did was sleep yet look where it brought me.
38. Officially an adult but my mom still sees me as her baby.
39. Thanks to everyone who’ve been with me for 21 years~
40. So excited to tell my grandkids one day how awesome it was to be twenty one.
41. Twenty one’s supposed to be fun, right?
42. Now I have to be cautious.
43. Been practicing how to mix drinks for three years just to show my skills today.
44. Legality is not equal to maturity.
45. When I turned thirteen, I wondered what twenty one feels like.
46. The age of accountability is 21. After a few months, you’ll start to question why you were in such a rush to arrive here.
47. Do I look good when at twenty one?
48. Look who ages like fine wine!
49. Favorite age of the lifetime: 21.
50. “I think age is a very high price to pay for maturity.” – Tom Stoppard
51. “When I was a boy of 14, my father was so ignorant I could hardly stand to have the old man around. But when I got to be 21, I was astonished at how much he had learned in seven years.” – Mark Twain
52. “You are only young once, but you can stay immature indefinitely.” – Ogden Nash

Funny 21st Birthday Captions

53. Can I now drink 21 bottles of beer?
54. 79 more years to reach a hundred!
55. Where’s all my booze at?
56. Can I pause time at 20? I don’t wanna be 21 yet.
57. ​​”After today, I’m celebrating my birthday in dog years.” – Unknown
58. “21 is so fun I think I’ll repeat it again next year.” – Unknown
59. Alexa, play “Twenty One” by The Eagles.
60. I never waited for this day but it came anyway.
61. “Birthdays are good for you. Statistics show that the people who have the most live the longest.” – Larry Lorenzoni
62. When I said I wanted 21 wishes for my birthday, my mom said no.
63. To all of my invited guests: “No gift, no entry”.
64. You ready for a full-blown hangover tomorrow?
65. “Tonight is the night you’re going to get lit — 21 candles, that is.” – Unknown
66. “Being an adult is great, they said. Don’t worry! I believed the lie, too — Happy 21st Birthday.” – Unknown
67. Wazzup to the kiddo who just turned adult!

21st Birthday Captions for Yourself

68. Don’t get too drunk on your 21st birthday, honey.
69. I just woke up one day and I’m twenty one.
70. Now I know why twenty one’s a prime number. ‘Cause it’s the prime of your youth!
71. Dancing to my own beat for 21 years.
72. “Go shawty, it’s your birthday.” – 50 Cent, “In Da Club”
73. You deserve all the love at 21.
74. Note to my future self: Don’t be to hard on yourself, you’re still adjusting to adulthood.
75. “It’s my birthday. I’ma do what I like. I’ma wear what I like. I’ma party tonight.” – Anne-Marie, “Birthday”
76. “I’m ready to paaaaarty.” – Bridesmaids
77. “Turned my birthday into a lifestyle.” – Drake, “Pop Style”

21st Birthday Captions for Friends 

78. On this day, twenty one years ago, this slayin’ queen was born.
79. I just wanna thank your parents for deciding to make you twenty one years ago.
80. I hope you don’t go out of breath blowing out 21 candles on you cake.
81. It’s your time to shine this year!
82. So glad to have witnessed your transition from a child to an adult~
83. No matter how old you are, I’ll always be by your side.
84. Turning twenty one is the best when you surround yourself with good people.
85. “You have been waiting for 21 years to be able to drink some alcohol. Hmmm. I know you didn’t! Happy 21st Birthday, instead!” – Unknown
86. You used to tell me you love coffee but now, you love alcohol better.
87. Always stay clean. Bring your alcohol(ic drinks) with you.

21st Birthday Captions Baddie

88. Let us toast for the best years and beers!
89. The first one to get drunk pays for the drinks!
90. Now I’d be able to do things legally.
91. I guess it’s my first time to drink (as an adult).
92. So this is alcohol tastes like when you’re an adult. It tasted different when I was younger.
93. I can now unleash my full drinking potential.

Good 21st Birthday Captions

94. Twenty one isn’t always about fun. It is an opportunity to grow into a better individual alongside your newfound adulthood.
95. I may now be legal of age but I’m still a kid at heart.
96. The great thing about turning twenty one is that you’d get to look back to your journey as a kid and learn from it.
97. Your 21st birthday is your pass to see a brighter future.
98. Be responsible, be independent, be the person you wished to be when you were younger.
99. Growing up is tough but growing more mature is tougher.Adulthood is not an age, but a stage of knowledge of self. – John Fowles
100. I spent my whole childhood wishing I were older, and now I’m spending my adulthood wishing I were younger. – Ricky Schroder
101. Two decades and a year of living.
102. Don’t be someone who grew up physically but remained immature mentally.
103. Twenty one may just be a number but it is a manifestation of how long you spent your meaningful life here on earth.
104. The great challenge of adulthood is holding on to your idealism after you lose your innocence. – Bruce Springsteen
105. The tough thing about adulthood is it starts before you even know it starts. – Robert Redford

21st Birthday Puns

106. I use to like milk but I’m more on champagne now.
107. Just because my age is legal, it doesn’t mean that 21 is a good idea.
108. “Twenty one is the magical age when responsibility starts to taste better than alcohol. Enjoy your new taste for responsibility.” – Unknown
109. Just enjoy tonight before you taste the aftermath your party.
110. Maybe there’s a reason why hangovers come after the fun.
111. Drink responsibly.
112. Rest In Peace to the ID that allowed me to buy drinks.
113. “He said it’s supposed to be fun turning twenty one.” – Taylor Swift, All is Well 10-Minute Version
114. I’m only a year older than 20 but the responsibilities now weigh heavier.
115. “Turning 21 is nothing to wine about.” – Unknown
116. “Drinking may not be the answer, but it’s worth a shot.” – Unknown
117. I’m only 21 but my ID says I’m 23.