50 Clever 21st Birthday Captions To Post on Instagram

Do you need some inspiration to post your 21st birthday pic? Here are 50 unique 21st birthday captions you can use on Instagram (and anywhere, really).

21st birthday captions
@amelia.edmonson on Instagram

Are you getting ready to celebrate your 21st birthday in style? Well, you better believe that the Instagram game is a big part of it. After all, how else will you show off your epic birthday bash to all your friends who couldn’t make it?

Finding good 21st birthday captions for Instagram can be tricky. You want to capture the spirit of the night, but you also want to be clever and witty. It’s a lot of pressure!

Don’t worry; I’ve got you covered. I’ve scoured the internet to bring you the ultimate list of 50 clever 21st-birthday captions to show your 21st birthday gifts with the internet.

From funny one-liners to unique ideas and even a few 21st-birthday captions inspired by song lyrics, you’re sure to find one that resonates with you!

We’ve even thrown in some fabulous hashtags to compliment your perfect birthday caption. So grab your phone, pick your favorite pics, and get ready to add serious style to your birthday Insta game. Let’s do this!



First, we have some unique Instagram captions that aren’t too sassy (for those of you who have mom on your Insta!)

1. Cheers to 21 years of being fabulous!

2. 21 years young and ready to take on the world!

3. It’s my 21st birthday, and I’m feeling lucky!

4. Growing older is mandatory, but growing up is optional!

5. Finally legal at 21! Time to raise a glass (or several)!

6. 21 years of awesomeness and counting!

7. Two years into my 20s, forever to go!

8. It’s my 21st birthday, and I’m ready to make some memories!

9. In my early 20s and still a work in progress

10. Just getting started on this thing called life!

11. I’m not getting older. I’m leveling up!

12. Here’s to 21, and here’s to being a masterpiece in the making.

13. I’m officially legal and ready to party like it’s 1999 (even though I wasn’t born yet)!

14. Here’s to 21 years of laughter, love, and lots of cake!

15. 21 years of being me, and I wouldn’t have it any other way!

16. I’m not getting older. I’m becoming a classic!

17. 21 years young and living my best life!

18. Living, laughing, and loving every moment for 21 years.

19. I’m counting my years in awesomeness, and I’m just getting started!

20. It’s my 21st birthday, and I’m feeling blessed!

Funny 21st birthday captions


You’ve got your outfit picked out, your friends by your side, and the perfect Instagram post planned. But what about the caption? You want to ensure it’s funny, unique, and captures the essence of turning 21. If comedy relief is more your style, hold onto your hats for these funny captions that will add a touch of humor to your Instagram post!

21. 21 years of life, and I’m still trying to figure out what I’m doing!

22. 21 years young and still not a morning person! ☕️🎂

23. I’m 21 and ready to make some questionable decisions!

24. 21 years old, and I still haven’t figured out how to adult!

25. 21 years of being fabulous, fierce, and a little bit clumsy!

26. It’s my 21st birthday, and I’m ready to drink like a fish (or at least like a mermaid).

27. Young and still not old enough to know better.

28. 21 years of being a hot mess, but at least I’m a fun hot mess!

29. 21 years and still rocking my awkward phase like a boss!

30. It’s my 21st birthday, and I’m ready to p-p-party (and by p-p-party, I mean pizza and pajamas).

Read: 16 Things to Do on 21st Birthday Parties

31. 21 years young and still not entirely sure what I want to be when I grow up! 🤷🏻‍♂️🎂

32. 21 years of being a masterpiece in progress (emphasis on the progress)!

33. 21 years young and still as awkward as the day I was born!

34. It’s my 21st birthday and I’m ready to par-tea (get it, like party with tea?!).

35. I still haven’t decided what I want to be when I grow up, but I’m open to suggestions!

36. Ready to rock and roll (or at least rock and recline)!

37. 21 years of being a work in progress, but hey, Rome wasn’t built in a day!

38. They say age is just a number… 21 is a pretty cool number!

39. I’m starting to feel like a fine wine… expensive and high-maintenance.

40. 21 years of trying to adult… and I still can’t fold a fitted sheet!


Song lyrics are perfect for capturing the essence of your special day, whether you’re feeling like a rockstar, a queen, or just a girl standing in front of a cake. With lyrics from artists like Post Malone, Taylor Swift, and Destiny’s Child, these captions are sure to make your post stand out and show off your unique personality.

41. I’m 21 and feeling like a rockstar! – Post Malone.

42. It’s my 21st birthday, and I’m ready to shake it off! – Taylor Swift.

43. Feeling like a million bucks! – Aloe Blacc

44. Here’s to 21 years of being a believer! – Imagine Dragons

45. I’m already living my best life! – Cardi B

46. I’m 21, and it feels like a love song! – Selena Gomez

47. I’m still just a girl, standing in front of a cake, asking it to be my birthday! – No Doubt

48. It’s my 21st birthday, and I’m feeling like a queen! – Queen

49. It’s time to get this party started! – Pink

50. 21 years of being a survivor, and I’m ready to celebrate! – Destiny’s Child

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