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150 Happy 21st Birthday Captions for Yourself and Friends


Turning 21 is one of those big birthdays that is worth celebrating in style. Whether it is for you or your friends, we have collected all the best happy 21st birthday captions for your next post or photo.

Now go ahead and browse through to find your favorite 21st birthday caption for Instagram.

Happy 21st Birthday Captions for Instagram

  • Wishing you many, many, more, 21 years can’t even come close to measuring up to all the great memories we’ve already shared. Happy Birthday!
  • Birthday wish? Already come true with this crew on my side. #21
  • How good is 21? It’s only the best age of all time. Enjoy your birthday, friend!
  • Here’s to another 365 days of being fabulous.
  • I’ll enjoy the best of today and laugh like never before because it’s my 21st Birthday.
  • Be careful what you wish for… My parents wished for me 21 years ago and look where that ended up.
  • Then I was only seventeen, couldn’t wait for twenty-one.
  • 21 and you’ve never looked better. Here’s to you!
  • The thing is I love birthday celebrations, but only when they’re mine.
  • Heaven has been really good to me by adding another year to my age.
  • Some things really do get better with age… Happy 21st birthday!
  • At 21 everything is possible and tomorrow looks friendly.
  • Another lap around the sun with the best people I could have ever asked for. Here’s to 21!
  • 21? Who cares. I just want cake.
  • Wouldn’t trade it for the world, I’m 21 now.
Balloon with happy 21st birthday captions for yourself
  • Can’t believe you’re 21. Here’s to another year of amazing memories.
  • I wish myself a happy 21st birthday since I am the definition of awesomeness. Self-love!
  • Today is a great day cause it’s my birthday!
  • The only things getting LIT today are the candles on my cake!
  • Everybody wants to be twenty-one, Full of life and life full of fun.
  • Made it to 21! I know. I’m as surprised as you are.
  • Who knew 21 could look this good? Aging looks good on you.
  • Chapter 21. Time to make some memories.
  • Excited for Chapter 21 with this crew on my side.
  • I’m grateful for life and for growth. I wish myself a happy birthday.
  • You have 21 bottles of beer to drink. I hope you already started.
  • Finally 21! It only took me 3 years to realize my adulting game was weak.
  • Hip hip hip, hurray! It’s that special day of the year once again.
  • 21 years later and I’m still a hot mess.
  • Wouldn’t have made it to 21 without these beauties. Here’s to another lap around the sun!
  • POV: You can’t believe I’m 21 now.
  • Happy Birthday to the smartest person in this world, Happy Birthday to Me!
  • So this is where aging ends, right? #Forever21
Cake with happy 21st birthday to me captions for Instagram
  • Twenty-one is a super important milestone birthday event. It means you have less than 80 years to hit 100.
  • Celebrate the sweetest person you know, by being the sweetest version of yourself. Happy 21st Birthday to my sweet friend!
  • Feeling unstoppable at 21 with this crew by my side.
  • Only 21, but forever the mom of the group.
  • I doubt tequila is the answer, but it’s worth a shot.
  • Finally 21 and legally able to do everything I’ve been doing since 16.
  • Cheers to the one day of our lives, when we actually celebrate getting old. Happy 21st Birthday to me.
  • 21! The one night you don’t get carded!
  • I’m shawty and it’s my birthday. #21
  • Glory is to God I am plus one today. It’s just 20+1.
  • 21 years of being your favorite pain in the butt. Here’s to 21 more.
  • Tripping on my own feet for 21 years. Here’s to many more years of clumsiness.
  • These beauties are the only gift I need. #21
  • Cheers to good friends, good vibes, and another 21 years.
  • Shoutout to my mama who was in labor 21 years ago.
  • Achievement unlocked: let’s drink! #21
  • Happy 21st. You’re legal, but you never stopped being our baby. We’ll always love you.
  • Age 21 but forever the baby of the group.
  • Can’t wait to tell our kids one day about how awesome and hot we were at 21.
  • Of course, I don’t know how to act my age. I’ve never been this age before!
  • Turning 21 with the best friends anyone could ask for. #grateful
  • I’m 21 now but age gives no guarantee on maturity.
  • Don’t wanna be sappy so… let’s just say 21 is already one for the books.
Cake with funny happy 21st birthday captions
  • Achievement unlocked: 21.
  • After today, I’m celebrating my birthday in dog years.
  • Another year older, but I’ll need some extra time for that ‘wiser’ bit. #21
  • Thanks for letting me bother you for the past 21 years.
  • Say hello to my new favorite 21 year old.
  • 21 is so fun I think I’ll repeat it again next year.
  • So I’m looking for someone to do my taxes for me this year. Happy 21st Birthday to Me!
  • 21 is the age of responsibility. Give it a few months and you will be wondering why you were in such a hurry to get here.
  • I want to thank everyone for my special 21st birthday, come and join me as I celebrate it.
  • Wouldn’t want to turn 21 with anyone else by my side.
  • We only got one year to be twenty one, twenty one, twenty one. One more baby, have some fun.
  • 21 is looking pretty good with this crew by my side.
  • Turning 21 with the best support system in the world. Thanks for making the past 21 years so unforgettable!
  • Another year, another candle on the cake. #21
  • It’s time to rhyme because 21 is for fun!
  • Helping this one ring in 21. Cheers to another lap around the sun!
  • Your 21st Birthday comes along with great responsibility. You’re responsible for not getting too drunk.
  • Age is just a number, but friends like these are forever. Thank you all for helping me ring in 21.
  • Birthdays are good for me. The more I have, the longer I live. lol.
  • 21 has never looked this good. Happy birthday
  • Grateful to have found my people by Age 21.
  • Thankful to be ringing in 21with the best people I know.
  • You really gonna scroll without wishing me a happy 21st birthday?
  • Start of Season 21 with the best co-stars I could have ever asked for.
  • On a scale of 1-10, feeling a solid 21.
  • Can’t wait to see what 21 will bring with these beauties by my side.
  • Making memories with this crew… 21 is already off to the best start I could have ever asked for.
  • Today is that day when I cried and my mother Smiled. Happy Birthday Mother’s lovely child.
  • 21 – time to make some pour decisions.
  • Got so distracted by cake, I forgot it was my own birthday. #SoThisIs21
  • Life’s too short to not celebrate every chance you get! Happy 21st Birthday to me!
  • It’s my birthday, so I’m celebrating everything.
  • I don’t care how old I’m turning, so long as there’s cake.
  • O.K., you know that what happens at the 21st B-Day, stays at the 21st B-Day.
  • Today is the day! You can finally “hit me with your best shot.”
  • Leveling up my adulting game. 21 and having fun.
  • Birthday mode: the youngest I’ll ever be, and the oldest I’ve ever been. #21
  • Cheers to another lap around the sun. Hello, 21.
  • Today is not for whining, it’s for wining!
  • Officially 21, but still mentally about five.
  • Been pre-gaming 20 years for this moment.

If you like these, you might also want to check out Birthday CaptionsBirthday WishesShort Birthday Wishes and our lists of First22nd23rd24th, 25th, 26th, 27th, 28th, 29th, 30th, 31st, 32nd, 33rd, 34th, 35th, 36th, 37th, 38th, 39th and 40th birthday captions.

Short Turning 21 Birthday Captions

  • 21? Bring it on.
  • Cheers and beers to 21 years.
  • So this is 21.
  • It’s my 21st… I’ll wine if I want to.
  • Keep calm and sweet 21 on.
  • Woke up a little older… but not wiser.
  • Well look who just turned 21…
  • Celebrating another level up. #21
  • Wow, never been 21 before.
  • That birthday glow. #Feeling21
  • Another year, another selfie. #21
  • I have mixed drinks about turning 21.
  • Card me, I dare you.
  • Wishing for you this year. #21
Cake with 21st birthday captions for friends
  • Yes, I become 21.
  • Waited 662,256,000 for this.
  • It’s no time to be 21.
  • Make a wish. #21
  • Season 21, Episode 1.
  • I’m not getting older. I’m getting better.
  • Time to see what 21 is all about.
  • Chapter 21, Page 1.
  • Bday wish for the bday bish? #21
  • Hello, 21.
  • Always been a savage, now I’m 21.
  • Be good to me, 21.
  • Lap 21 around the sun…
  • Just like wine, better with time. #21
  • 21 looks pretty and good to me.
  • I think 21 looks good on me.
  • Turning 21 is nothing to wine about.
  • Here for cake, and cake only.
  • I’m just here for the birthday cake.
  • Favorite day of the year. #21
  • I can’t keep calm, it’s my birthday.
  • Start from the bottom now I am 21.
  • (Legal) cheers to finally being 21!
  • Say hello to the world’s latest 21 year old.
  • And so begins Chapter 21.
  • Birthday behavior! #21
  • Staying 21 until further notice.
  • It took 21 years to get this awesome.
  • Aging and raging. #21
  • Agent of chaos for 21 years.
  • Ringing in 21 with the best crew.
  • Who wants to see my ID?
  • Growing and glowing. #21
  • Experience level: 21.
  • Level up. #21
  • 21 and legal proceed with caution.
  • Getting badder with age. #21
  • My day, my way. #21
  • 21: Wild and free.
  • 21 21 21 21 I feel like 21.
  • 21. Serving cake, and serving looks.
  • Hey Siri, count the candles.
  • Only took 21 years to get this cute.

So that is it for our list of Happy 21st Birthday Captions for Instagram. We hope you found the perfect one for you.

Now go share your photo!

Woman holding up a clear chunk of ice on the beach

About the Author

Laynni Locke

I am Laynni Locke, a Canadian writer, reader and traveller with a passion for sharing life’s moments on social media. Keeping friends and family in the loop of our lives though photos and videos has become an essential activity for most.

And it doesn’t matter if you are travelling, celebrating a special occasion or just appreciating day-to-day life, when you take that perfect photo you are going to need the perfect caption or quote before you share it. Which is why we started Routinely Shares, providing comprehensive lists of quotes and captions to cover every occasion, adventure or loved one.

With extensive experience as a travel writer, social media specialist and grant writer, I have made it my mission to curate the best and easiest to use lists for your next post.

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